We're having about 20 kids at ours, 16 of them will be under 12, they range from 1 year - 17 years. I am having the little ones 2/3 & under at the table with their parents and the older ones up to 15 on a kids table, then I've got 3 nephews 16-18 that will be sitting with the adults. Most of these kids are my nieces & nephews, so I know they get along really well together & the older ones always look out for the younger ones, plus the parents of the younger ones on the kids table will be on the table right next to it, so they can keep an eye on them.
I am doing up a booklet for the ones up to 15 which has colouring in, cross words, join the dots, find a words - things like that. I will customise it to each child & their age - mainly colouring in & blank drawing pages for the littlies & crosswords ect & a few colouring ins for the older ones. Girly stuff for the girls, boy stuff for the boys. I will then put pens, pencils, crayons ect on the table for them. I'll get individual ones for the ones on the tables with their parents. Although a couple are only babies, so they won't need anything, but I might try to find a little toy or something for them so they have something. There is also a separate room at the function centre, right next to where the reception is, which we will be setting up with couches & beanbags, TV & DVD player, so the kids can go in there & when they get tired they can crash in there. Although, knowing my nieces & nephews they'll be out shaking it on the dance floor with the rest of us!!!