Try to find out WHY ur residents do not want to participate. That is your first challenge ... It maybe as simple as one resident doesnt want to sit next to another particular resident, maybe they cant hear/see whats being done. And find other things for them to do. They may not have been a very social person in the past.
Your website is wonderful! I use it almost on a daily basis. My people LOVE the word ladders! They can't get enough of them. I will continue using it as long as I'm working as an activities person!