I've been a CM consultant for almost 8 years and I have done all sizes of crops. I would suggest you invite 2x the number you would like to have. 6-8 is ideal for me, but I would do one for any size group. Have fun!
Thanks for clarifying! Yes, they are too cute. I hadn't paid attention and seen the "On the Go Essentials" name. I've just been calling them the mini picfolios!