Hi Everybody!
I have a place for such meeting:
http://www.schroniskolupki.republika.pl/
It's near german and czech border. Near to Karkonosze Mountains (Reisegebirge), about 30 km north of Jelenia Góra. About 60 km from E40 Autobahn border crossing in Gorlitz. About 40 km from nearest polish-czech border crossing.
I've been there last year. Very fine, old building, good meals, and very cheap. One night about 6 euro, 3 meals-about 3 euro. There are 41 beds in the building, but you can also sleep in tents.
I've been talking with the boss of this place today, and he approves this idea. Only we must organize it not in the time of school holidays in Poland. But in May, first half of June or in September - no problem.
Zbig-Sutjeska