You may need a visum to enter Switzerland; please check the Swiss regulations. Note that Switzerland is part of the Schengen area since December 2008, that is, a Schengen visum is valid to enter Switzerland.
On request, the organizers send to you a letter of invitation for CG Week 2020, provided that you are an author of a paper that has been accepted to one of the CG Week events, or - at least - you could have been such an author. "Could" means that either you are a more or less established researcher or maybe a student of an established researcher.
In such a case please first check with the embassy or consulate where you plan to apply for a visum, whether you need a letter of invitation and - if so - in what format. Some embassies require the letter to be sent from us to them directly, whereas in other places you have to provide a (paper) letter that we have to send to you via snail mail.
Once you know what is needed, please contact the organizers, for instance, via socg20@inf.ethz.ch, and provide the following information:
