This is great @loleg - really useful and an inspiration for others e.g. i know @teemu.ropponen and Finns have MyData at end of August.
One more community-run event! On November 23 & 24 we will get together in Lausanne to focus on a core national problem: bridging the linguistic divide! Check out the hackathon announcement in five languages here: Plurilinguism 4.0 – The Hackathon | Forum Helveticum
this should be a pinned topic on and every person who dedicate a little bit of their time to disseminate the events of their own country should get a special badge. So good, thank you very much.
Thanks @stephanyzd 
It’s been a marathon…I mean, hackathon year, and I can barely keep up with all the event announcements. In fact a data-ful community like ours should really come up with a better solution to keeping people updated & involved…<ahem/>
I would love to visit Switzerland one day, are the dates the same this year? Maybe I could pack and go 
Hi Gregory, welcome to the forum! The following dates were announced on our blog at the beginning of the year:
4. July, Bern
Opendata.ch/2019 Forum (unconference)
6.–8. September, Sion
mix’n’hack, 5th Swiss Open Cultural Data Hackathon
18. October, Bern
DINAcon 2019
29.–30. November 2019, Luzern
Open Tourism Hackdays
There is a community calendar here, and besides that I’d suggest dropping a note here or on #opendatach to see what else is happening around the time you are here. Or to get together for a spontaneous meetup … or an Open Data Beer (next: September 4)