13th Birthday Trouble Plz Help

Heyy im coming up to my 13th birthday and i want something BIG like a disco but not a disco because everybody else has had a one and are fed up with them and i want to invite boys and girls and i can have up to about 100 people but i dont want it to be expensive the most about £60-£70 thats the prob i cant think of any games to play iether ive only got the idea of truth or dare!! plzzzz help me from worried xx