The party favor bags could include a small bag of Circus Peanuts, animal crackers, foam clown nose, plastic toy tigers and elephants, deflated balloons (for older children only), and circus theme stickers.
A cute idea for the party would be to have the guests have tickets for each of the games they would play. Be sure to have tons of balloons!!!
You can usually find, for a fairly inexpensive price, those popcorn containers that look like movie popcorn bags and put goodies in those.
If you want to do the face painting yourself – you can buy foam shapes at Michael’s crafts and dip them in face paint. Then tattoo the image on the child’s face – you’ll get a crisp outline of the shape which you’ll be able to fill in with small brushes and face paint.