Yes. You can register for free by connecting to our registration platform. If there are no places left, try again later as some visitors may cancel their registrations.

You can register for free by connecting to our registration platform. If there are no places left, try again later as some visitors may cancel their registrations.

No. All activities and visits are accessible on a first-come, first-served basis. On the day you attend the CERN Open Days, check our mobile application to verify the wait time and status for each activity. In particular, LHC visits will be limited. More details on the Open Days website.

No. At registration time, you define your site of arrival. However, you can access all other sites, using the CERN Open Days bus, with your visitor wristband.

While registration for the Open Days is required, underground visits do not require special registration and are accessible to visitors over 12 years old and complying to safety rules, on a first-come, first-served basis. Visits to LHC detectors and tunnel will be limited. More details on the Open Days website.

Registration is required to guarantee your access to sites. The number of registrations is limited due to site capacity limits. Try again later as visitors may cancel their registration.

LHC underground visits are not guaranteed and will be limited. More details on the Open Days website.

LHC underground visits are not guaranteed and will be limited. More details on the Open Days website.

Yes. You can update the number and profile of visitors, arrival site and time within the limit of the number of places available, or inform us of a change to your means of transport. These changes will help us organise your arrival. To update your registration, connect to our registration platform and ask for a new passcode, using the same email address as the one you used to register initially.

No but you can do it yourself. You can update the number and profile of visitors, arrival site and time within the limit of the number of places available, or inform us of a change to your means of transport. These changes will help us organise your arrival. To update your registration, connect to our registration platform and ask for a new passcode, using the same email address as the one you used to register initially.

Yes. You can cancel completely your registration. This will allow other persons to participate. To cancel your registration, connect to our registration platform and ask for a new passcode, using the same email address as the one you used to register initially. Then click on the "cancel" button for the registration you want to cancel.

Please check your spam folder to find the e-mail. If you do not find it, it is probable that you did not go to the end of the registration process. Please reconnect to our registration platform with a new passcode and try again. If you find your registration on the registration platform, you can ask for the confirmation e-mail to be sent again.

Follow the instructions specific to your point of arrival (defined at registration time) on the “Getting here” section. Public transport is advised when possible.

Car and motorbike parks will be available in neighbouring areas to CERN. Dedicated parking for motorbikes will be available in the Hôpital de la Tour staff car park (Meyrin). There are no dedicated parking spaces for electric scooters. Please note that cars, motorbikes, bicycles and scooters will not be allowed on any of the CERN sites. More information on the “Getting here” section.

Some activities are restricted to visitors over the age of 12 years old. Check the minimum age requirement on the descriptions of the activities you are interested in.

For safety reasons, it is mandatory to have one's face uncovered at all times, except in cases justified by medical reasons (for example, masks against influenza contamination) or professional ones (for example, dust masks). Closed, flat shoes are strongly advised for all visits to buildings and facilities. For visits to the LHC and certain other areas, open-toed shoes or sandals are strictly prohibited and access will be refused. 

Once you reach your arrival site, you can navigate between the various sites using Open Days buses, while mini-trains will transport you within CERN’s main sites in Meyrin and Prévessin. More information about the buses and mini-trains here.

Open Days buses will run throughout the weekend to take you between the various sites. The schedules for the buses can be found here.

To find out the code of a given activity, click on the activity and the code is under the activity’s title. In addition, on the “Activities” section of the Open Days website, you can enter a code into the code field of the search feature to find the corresponding activity.

Refreshments will be on sale at all visit sites.

For legal reasons, there will be only one souvenir shop and one bookstore on Meyrin site. You will find books, T-shirts, gadgets and much more.

The use of cameras and video cameras is permitted, please follow instructions from the guides.

There won't be any public Wi-Fi access during the Open Days. It is advised to use 4G connection to Internet. Warning: CERN straddles the franco-swiss border and roaming fees may apply depending on your subscription.

CERN is a non-smoking laboratory. Smoking is allowed only in specially marked areas. All buildings are non-smoking. 

No. Travel light and do not bring any bulky items of luggage with you: there are no luggage lockers available for storing your bags. Note that all bags brought to the Open Days will be inspected at each site entrance. In addition, some underground sites have restrictions in terms of what you can bring with you.

Food and drinks are not permitted in the exhibitions.

There are no child-minding facilities. However, some visit points are suitable for young children. Children should be accompanied at all times.