I've actually already created Wario-ware and Teamwork, both using events.
Wario-ware, for blockland, would be like this: You start in an arena-ish place. Minigames would begin to pop up, not lasting longer than 10 seconds each. You can make it like elimination (Lose a minigame, die) or points (Beat a minigame, get a point. Most points at the end of the round wins!) After 20 or so minigames, there could a boss minigame, lasting a few minutes or so. Now, to the minigames. Some minigames include: Shoot the Target! Kill a player! Stand on a block! Solve a math problem! Destroy a Jeep!(Or any other destructable vehicle) Click the [Color] Block! Don't get knocked out! (Players have pushbrooms and the walls kill) Run to the other side! and all that jazz. Some minigames might need custom arenas to fit, like Run to the other side!. Here's an example of Wario-Ware.
http://forum.blockland.us/index.php?topic=180956.0Teamwork is again, 4 courses,a race, challenging co-operation between your teammates, such as:The Stack challenge (Players must stack themselves to let someone over a wall)
The Button Challenge (Players must each push a button at the same time)
The Pit Challenge (Someone must go down a pit to push a button)
All that jazz. Just build one course with very little bricknames (Using relays for events)
then duplicate the 1 Course and make 4 courses with it.
Ghostbusters is just it. A team of Near, or completely invisible players, (Ghosts) Who could run through a course, or survive for some time or something to win.
The Busters, who would probably have this weapon, or a spraypaint can in order to make the Ghosts visible, and possibly another weapon to kill them once they can see them. It'd add a bit of "I spotted a ghost! He's heading to [somewhere]" hopefully.
/wall of text of detail
You can change these ideas however you feel like.
for 5 dollars per idea