DD's party is on Sunday and it looks like it's going to be a wash out

I was planning on just sticking them out in the yard and letting them run wild, but i guess that plan is scrapped. we have a wide age range coming (1-10) and I have no idea what to do with them now. the party is at my moms so unfortunately there will be no toys there at all. any ideas? i think i'm screwed!
Re: CBC: what inside party activities do you have planned?
I have no suggestions for you because I'm in LA and it's unlikely we won't have sunshine that day, but thank you for saying this. I had given zero thought to the idea that some babies may want to play inside. I pan to just put a few of E's puzzles and blocks and stuff out on the rug.
my DD's party is on sun. too and it's going to be 50 w/ chilling rains! wtf!! seriously i booked a pavilion at our local part so we're stuck w/ having an outdoor party! good times! i'm so bummed!! we have 70-80 guests so there's no way unless absolutely necessary will we have it at our house.
But anyway, check out target!!! they have pin the nose on the pumpkin, and other games like splat that spider or something like that. lol they have lots of $ give aways for toys that kids could win etc...
The other thing i thought of but too late was buying a bunch of minnie pumpkins and painting them and that was going to be their gift too.