The event will take place at the Hotel Les Sources, Les Diablerets, situated in the heart of the Alpes Vaudoises and within easy reach of the towns of Lake Geneva region.
The most convenient airport nearby is Geneva. Other airports you could consider are Basel, Zurich, Lyon, or even Milan -- they would just involve longer journeys by train.
Travelling to Les Diablerets typically requires taking a train to Aigle, at the other end of the Lake of Geneva, and from there a narrow-gauge train (R24) up the mountain (15 km, about 54 minutes). The Hotel Les Sources is only a short walk from the train station in Les Diablerets.
For information on Swiss trains, see the SBB webpage. Tickets are often considerably cheaper when booked in advance, depending on how early you book. The whole journey from Geneva is very scenic and well worth making by daylight.
All restrictions related to Covid-19 mitigation have been lifted by the Swiss authorities, as of 1st of February 2023. There is no Covid-19 status certificate, so everyone can circulate freely.
Updates (on both cantonal and national regulations) are provided here, and also here.
