Ideas/advice for bday party

We are having my son's third bday party at the house in Feb. I was planning to have a few crafts out, legos, other toys. It will be about 10 kids ages 16 months - 4 years old. We have a split house, so the play area is downstairs and we'll eat upstairs. Questions/advice:

1) Is this a bad idea? Too many kids in one place? I just thought it might be better and cheaper than at a place.

2) Doing a robot theme - any crafty ideas? Was thinking to get foam stickers to decorate a robot?

Ideas/advice for bday party

I had dd first birthday at my house and the biggest hit were kids tattoos.