Other places that have large spaces that could be borrowed for a while would be church fellowship halls, senior centers, community centers or the like. Come ready to work, lay it out and take a picture. If you are allowed sew the rows but it not, rely on your photo.
I have been known to push back the furniture in the living room to create a larger space to lay out blocks too. I bet many of us would love to have the large table that Donna Jordan has but that is her business work room and not her home sewing room. So, we improvise.