I would suggest quilters Jeopardy. Make up catagories like famous quilters, early quilt block patterns, quilting designs( for completed sandwiches), Quilt shops online, quilt shops local, Pre cuts and their names, Name that block, Popular fabrics lines( fusions, fossil fern, etc.) You get the idea.
Because the group is large separate them into teams , give each team a unique buzzer sound they have to make.