Mary, I've hosted several CIJ parties and we've had a blast. I've posted this before, but we have theme parties. Some of the themes we've done are silly Christmas hats or headbands, a Hawaiian Christmas, and our favorite was a Mad Men theme. Each had food appropriate to the party and honestly I've not had it the past few years because my daughters grown and out of state, but my friends still ask me EVERY year if we are doing it. I do only invite the people that will appreciate it though for sure. No Bah hum bugs!
But if it's the ONLY time the siblings get together than that's definitely something to take into consideration.
I've also done a CIJ scrapbook party with my friends...that was SUPER fun. I've only done it once because I've never been able to get everyone back together again for that, but I'd do it over in a heart beat.