My two cents
Active communities
These are the communities that I know are active in 2023 around the topic of Service Design in Switzerland:
Service Design Network Switzerland Chapter creates events mostly remotely
Hey Service Design in-person meetups in Zürich
Inactive communities
In the past, there was also a meetup called Service Design Drinks in Zürich and another one called Service Design Apéro in Zürich and hosted by the company Liip, but It seems these meetups aren't active anymore in 2023