I like skills games best.
Clothes peg game. How many clothes pegs can you peg on to a washing line in 1 minute. The winner gets a prize.
Flower pot game. How many marbles can you put through an upside down flower pot in one minute using only a spoon and not your hands to touch marbles. Winner gets a prize.
How far can you kick a football? £1 a go. You get some very competitive Dads wanting a go. Categories Adult females over 13, Adult males over 13, under 12's, under 7. Winner in each category win a football. You might be able to get a sports shop to donate the footballs.
Treasure Hunt. Use a large board with sand on. Put coordinates eg letters and numbers bury a couple £1 coins, 3 50p coins, and a 5 x 20p pieces. Make sure coins are buried under the centre of the square. Give them a spoon to dig with. Have wet wipes on hand to wipe off fingers.
Guess how many sweets in a jar. Winner person closest to correct number. If 2 winners tiebreak with a second smaller jar. Runner up wins smaller jar.
Lucky dip with small prizes costing approximately £1. Charge £2.50 per dip.
Plant stall. Ask parents for plant donations before event. Also take cuttings and grow on in potting compost. Popular after the end of May.
Name the Teddy bear. Give Teddy a really common name it is likely someone will choose and put name it in a sealed envelope. Name guesses written on a large piece of paper with their mobile number next to it in case they win. £1 a go. If no one wins the bear. Sell it to the highest bidder at the end of the fate.
I've got a candy floss maker so might do that.
I hope you have sunshine.