Bike to Work is back at CERN, encouraging everyone to leave their car behind and enjoy the benefits of active travel. Choose a healthier and more environmentally friendly way to commute during May and June, or continue biking if you are already regularly in the saddle.

To take part, form a team of four colleagues - one of whom can participate as a pedestrian - and take on the challenge together. The goal is simple: commute by bike (or on foot) regularly, at least one day out of every two during the period of the campaign. It’s not about the number of kilometres you cover but about helping to build consistent, sustainable habits.

Whether you’re a seasoned cyclist or just getting started, every active commute contributes to your well-being, strengthens your connection with your colleagues and helps to reduce your impact on the environment.

Sign up on the Bike to Work website, where you can also apply to join an incomplete team. Ready to get moving?

A big thank you to all of you who sent in your photos for our photo competition on the theme ‘Spring at CERN’. We really enjoyed looking through them and it wasn’t easy to choose the winner. They are now available in a CC-BY photo collection, shown as a slideshow here:

Congratulations to Aneta Sabanovic from the IPT department, who wins the Chocopass kindly offered by the CAGI cultural kiosk at CERN and Geneva Tourism. The pass gives her the chance to explore Geneva for a day and taste chocolate from a range of chocolate shops.

We’d like to thank the International Geneva Welcome Centre (CAGI) and Geneva Tourism for offering a Chocopass to the winner! The CAGI cultural kiosk is located in CERN’s main building and is open from Monday to Friday from 8:30 a.m. to 1:30 p.m. It offers numerous discounts for local activities and events both in Switzerland and in France – Find out more about CAGI on their website.

Ethics is essential, in particular in our workplace. It contributes to a positive and productive work environment while also fostering trust among us, as CERN contributors, as well as the trust of our stakeholders, such as Member States, contractors and research institutions.

At CERN, our ethics-related framework is designed to guide us to act in accordance with the Organization’s values and with the conduct that is expected of us, and to establish and maintain a respectful working environment. It is up to each and every one of us to respect it.

To ensure that everyone is aware of the guidelines of our ethical framework, the HR Department has developed an e-learning course entitled “Ethics at CERN”, which is available in English and French on the CERN Learning Hub. As of now, this course is mandatory for all members of the CERN personnel.

To make our ethics-related framework more easily accessible, all the relevant information and resources can be found here: https://hr.web.cern.ch/ethics. If you have any ethics-related questions, please contact info-codeofconduct@cern.ch.

To go further, take the new e-course “Managing Conflict of Interest”

This online course introduces CERN’s policy on conflicts of interest and explains why identifying and managing such situations is essential for maintaining trust, integrity and fairness in the workplace.

The course addresses the following topics:

• What a conflict of interest is and why it matters
• The difference between actual and perceived conflicts of interest
• Examples of common conflict situations
• CERN’s policy on and official definition of conflicts of interest, including the rules on gifts, favours and hospitality
• Your responsibilities
• Where to find further guidance and support

The module also includes case studies to help you to recognise and respond to conflicts of interest in practice. Register now on the CERN Learning Hub.

On Saturday, 25 April 2026, marking the International Girls in ICT Day, the CERN Science Gateway will be opening its doors to girls aged 12 to 16 for a morning and afternoon dedicated to exploring the digital world.

This global event encourages girls to explore the many opportunities offered by information and communication technologies. 

Discover how artificial intelligence systems like ChatGPT work!  Or how a computer recognises images, sounds and even music. With scientists from CERN, you’ll learn how to train your own AI system and understand its strengths…and its limitations.

What if you created your own smart wristband?  In this workshop, you’ll train a model capable of recognising your movements (walking, jumping, clapping). It’s an amusing way to understand how AI can apply to real life!

Sign up and find out more, and check out the many activities being organised at the CERN Science Gateway throughout the day.

Don’t miss the next lunch & learn conference organised by the CERN Medical Service on the theme of “A healthy mind for a calmer future”. This latest session will be held in the Dirac Room (40/S2-D01) from 11.30 a.m. to 1.30 p.m. on 22 April and will focus on the topic of “Mind-Body connection: science, experience and resilience”. It will feature a talk by Dr Benzakhour from the Geneva University Hospitals (HUG) and a personal account by our colleague Julien Fernandez from the EN Department, who will share his journey on “Learning to live differently’.

Spaces are limited, so register now!

The event will also be webcast and recorded.

14 Apr 10:00 | Physics | Salle Dirac & Online | QTI Seminars | EN
Atom interferometry : from practical quantum sensing to fundamental physics searches

14 Apr 11:00 | Physics | Main Auditorium & Online | LHC Seminars | EN
Study of top quark pair production at the threshold using CMS data

14 Apr 14:00 | Physics | TH Conference Room & Online | String Theory Seminars | EN
Taxonomy of branes in infinite-distance limits

15 Apr 12:00 | Knowledge Transfer | IdeaSquare | IdeaSquare Workshops & Events | EN
Prototyping at CERN

16 Apr 17:00 | Knowledge Transfer | Online | CERN Alumni | EN
R1 Talk: Responsible AI: Lessons from Building WORB

16 Apr 17:00 | Knowledge Transfer | 774/R-013 | CERN Venture Connect | EN
Scientist to Founder: From Research to Venture Creation

17 Apr 17:00 | At CERN | CERN Alumni | EN
Soon-to-be alumni networking event (for contracts coming to an end between April and June)
Email alumni.relations@cern.ch to register

17–18 Apr 10:00 | At CERN | Meyrin Centre, Geneva | World Liver Day | EN
Free liver scanning

23 Apr 10:00 | At CERN | CERN Science Gateway Auditorium & Online | Director General | EN & FR
Town Hall

24 Apr 16:00 | Accelerators | BE Auditorium Meyrin & Online | BE Seminars | EN
Performance limitations due to beam-beam interactions and wakefields in high energy lepton colliders

25 Apr 08:30 | Knowledge Transfer | CERN | Public Events | FR
Girls in ICT 2026 – Découverte de l'informatique au CERN

28 Apr 17:30 | At CERN | Main Auditorium | Staff Association | EN
Steer Your Own Path: Resilience and mindset lessons from a 46,000 km bicycle journey around the world

28 Apr 18:30 | At CERN | IdeaSquare | IdeaSquare Workshops & Events | EN
HOPE Networking Event

29 Apr 20:00 | At CERN | CERN Science Gateway | Public Events | EN & FR
Hunting the Higgs

4–8 May | Knowledge Transfer | TH Conference Room & Online | TH Workshops | EN
Gravitational waves from amplitudes

7 May 12:15 | At CERN | CERN | Staff Association | EN & FR
54th CERN Relay Race

8 May 10:00 | At CERN | Library | Archives, Library & Open Science Events | EN
Meet the author of "A concise history of radiation detectors: Hunting for the unknown"

13 May 16:00 | At CERN | Library | Archives, Library & Open Science Events | EN
Meet the author of "STARBORN: How the stars made us - and who we would be without them"

Save the date: 18 July | At CERN | CERN | Staff Association | EN & FR
CERN Hardronic Music Festival 2026

4–8 May | Computing | CERN | SC4RC | EN
Sustainability Conference for Responsible Research Computing

5 May–24 Nov | Knowledge Transfer | CERN | Knowledge Transfer | EN
CERN Entrepreneurship Academy 2026

20 May | Knowledge Transfer | Lausanne | FameLab | EN
FameLab Switzerland Lausanne Heat

22 May 14:00 | At CERN | Online | Micro-Talks | EN
Thriving with Confidence: Moving Past Imposter Syndrome

25–29 May | Computing | Chulalongkorn University | CHEP | EN
28th Conference on Computing in High Energy and Nuclear Physics (CHEP 2026)

8–12 Jun | Knowledge Sharing | CERN | CERN IdeaSquare | EN
CERN IdeaSquare Journal of Experimental Innovation Summer School

15–26 Jun | Accelerators | Jūrmala, Latvia | CERN Accelerator Schools | EN
CAS course on Medical Accelerators

19 Jun–2 Jul | Physics | Ostróda, Poland | CERN Schools | EN
European School of High-Energy Physics

22 Jun–28 Aug | Experiments | CERN | CERN NextGen Triggers | EN
CERN STEAM Academy

1–10 Jul | Physics | Bucharest, Romania | CERN Schools | EN
16th International School of Trigger and Data Acquisition (ISOTDAQ 2026)

14 Sep–18 Sep | Engineering | Rio de Janeiro | RPC Conference | EN
XVIII Conference on Resistive Plate Chambers and Related Detectors

20 Sep–3 Oct | Accelerators | Peebles, Scotland | CERN Accelerator Schools | EN
Introduction to Accelerator Physics

22 Sep–1 Oct | Knowledge Transfer | Sarajevo, Bosnia and Herzegovina | I.FAST | EN
I.FAST 2026 Challenge

14–27 Oct | Physics | Taouyuan, Taiwan | CERN Schools | EN
2026 Asia Europe Pacific School of High-Energy Physics

This is a curated list of events relevant to the CERN community.
More events are available here: home.cern/events
Indico also shows ALL events happening today, this week and in a calendar view. 

If you would like your event to appear on an upcoming Bulletin events list, please contact bulletin-editors@cern.ch