How do I entaint kids of all ages at a party?

[Pennies]

I've got a BBQ happening next saturday (where's the sun????) and I've got kids coming aged from 2 weeks up to 9 years. There will be 20 kids in all.

I did have a face painter booked but she's ill and I'm wondering how I can possibly entertain these kids?

Any ideas? Will think £££'s later - ideas are the key thing at the moment.

The last barbeque I went to had a trampoline and a football. The boys (and my 4 year old daughter)played football the whole time.
All the children boys and girls (ages 3 to 10) played on the trampoline.