Indoor party activities for different aged kids

[tintinenamerique]

My son turns one next week and we've opted for small (ish) gathering at home with family and friends. There will be a few kids there (7,5,3,2,1 and a few tinies). What can I plan for the older ones to keep them from getting bored? If we're in the garden it's all a lot easier, footballs and other outdoor things, but inside???

Big boxes of lego (if you can stop the little ones putting it in their mouths!).

Toy cars, dinosaurs, farm animals if you have them.

Teddy bears picnic.

Art and craft type things.

Decorating cup cakes/biscuits.

Crafty stuff is good, especially involving stickers in my experience. How about decorating a plant pot and planting a bulb in it?