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I play in a group of three in a multipurpose room at our church. We play on a folding table with a plastic top. It gives us all the space we need for the game along with a laptop for running the Gloomhaven Helper app (which saves us a ton of space, time, and frustration). In addition to the legs folding up, some of these types of table have a hinged tabletop, which reduces the size of the table to about the size of a small folding card table.
Here's a link that I found on Amazon, but you can also buy these in any office supply store: