On the 100 meter dash use the wii remote (not the nunchuk) hold it with both hands and when it says go shake it really fast and you will get a great time. For the best results use Mario,Shadow,or Sonic.
If you place a sticker on a question mark in London Party, one of these events will happen. Chao: Bonus Sticker Orbot & Cubot: Copies one of your stickers. Chain Chomp: Removes stickers from the leader Omochao: Gives a sticker to one of your opponents Magikoopa: Takes away stickers Boo: Swaps your page with the leaders Dark Chao: Gives or takes away a question mark.
In the London Party Competitions, you play one of the events to try and gain stickers. You gain 5 stickers for 1st, 3 for 2nd and 1 for 3rd. You choose the game if you are playing one player, or the person in last chooses if you are playing with 2 or more players.
Try not to swing too early, as you will miss the ball and the you will hit the ball very high and allow the opponents to smash it, or you will just miss altogether. It will take a while to get used to, but then you should be able to win this event quite comfortably.