Games to play with your premade
Do you and your premade team find yourself in situations where you're beating the enemy team so thoroughly that it's boring? If so, here are some games you can play while you wait for the enemy to surrender.
Killing Contest Straight up killing contest. Whoever has the most kills at the end of the game wins.
Variants
Simon Stuns: To play this game, the support designates one of their crowd control abilities, such as a stun. At the beginning of each team fight, the support marks an enemy champion by using this ability on them. Once a target has been marked, the other players compete to see who can land the killing blow on the target. That player earns 1 point. Play continues until the match ends, or until someone has a certain number of points. Whoever has the most points at the end wins.
Search and Destroy: To play this game, all team members begin at spawn. Players vote to pick an enemy champion, and agree on a start time. Once the game clock reaches that point, players race out of spawn to find and kill the chosen champion. Whoever lands the killing blow wins.
Base Race This game is inspired by the custom game Draft Racing. All players begin at spawn. At an agreed upon start time, everyone races to reach the enemy base, dive past the towers, and die in the enemy spawn. Whoever dies in the enemy spawn first wins.
Donger Dash Inspired by the custom game of the same name, all players begin at spawn. At an agreed upon start time, everyone runs around the map through the outer lanes, traveling counterclockwise. Players must run past the enemy turrets, through the space between the enemy nexus and spawn, and all the way around to reach their own base. This counts as one lap. Players may not return to their own spawn to heal. Whoever completes the most laps before dying wins.
I hope this helps alleviate boredom. Feel free to add your own games below.