Gustaf III:s wänner is not a society with members but a group of friends who arrange 18th century events that are open to anyone. Their philosophy seems to be fun over elitism which sounds excellent!
Fashion and culture from the 1700s.
A video from an event held by 18th century society Lumières. There are some more videos from the same event and other Lumières events here.
L’Âge des Lumières
I posted a link earlier about this German 18th century society, but this seems to be their main website.
Vive la joie!
German 18th century society. The site has very small pictures though so you can’t see much.
Here’s another site with more pictures from their events: 18tes jahrhundert.