Informal gathering late Sunday afternoons. Arrival time is open but generally after 3pm...Kaffe VonSolln closes at 5:30pm.
Even if no one responds with a positive RSVP, members from the group may or not be there. Often there are other German visitors, so you may be able to connect with non group members as well. If Yalcin, the Kaffee owner is there, he would be happy to converse in German with you!
Meetup automatically posts a positive RSVP for the host, but I may or may not be present.