So far all good ideas!! Let me add a few
One retreat I went to we all did a churn dash in Civil War reproductions - Had a drawing and one person went home with it.
Another one we all brought something antique related to sewing. Some brought old quilts, old tools, all sorts of things were shown.
Another one the ladies took a canning jar - made a pin cushion on top. We were required to "bring" our favorite hand needles, thread and a small notion. They took these and filled the jars with them adding some English paper piecing materials (papers and fabric)
One other time we brought FQs and they were a raffle item. Once I got a coffee mug. Lots of fun things to do!! Just remember to have fun.
Let us know what you do!!