Could it be an idea to book the whole hotel? Would be nice if we as a group could wreak havoc for three days and two nights without disturbing people. It would, of course, depend on the cost and how many of us who will shop up.
If I do show up (probably will! I only have 310 km/192 miles to Umeå) I could bring some board games. Perhaps 10 from this list: https://pastebin.com/v0qYkEpY