I did a sponsored slim which worked well and raised loads of money for our local children's home. We have done a mini garden fete with tombola, white elephant stall, second hand book stall, did cream teas, we had an M&S in those days and they sponsored all the clotted cream ( worth contacting them for help). We have done auctions but auctioned donated items as well as services, baby sitting etc. That is an easy one and raises loads of money.
Sponsored swims, walks,karaoke, a race night, ( horse racing on film ) a sports day in the local park with fun events like the 3 legged race, sack race, egg and spoon, wheelbarrow race etc ( participants pay to enter and a *bookie *on the field takes bets ).
Quite recently we did a dog show for an organisation called HELP all the classes were fun classes, dog with longest tail etc. Every class was sponsored and the participants paid to enter. We served soft drinks and hot dogs and had a home produce stall. That was a good money spinner.
Good luck !!!