I also have an event idea that I just remembered after seeing [member=44]Viron Roan[/member] 's suggestion.
It's called Search and Destroy and it's from the Call of Duty and CS games. It's one of my favorite game modes.
There's a tutorial on how to play it here.
From the tutorial:
First off, you need a Search and Destroy map in your base folder. Here is one: https://jkhub.org/files/file/1333-search-and-destroy-tatooine-streets/
How to play:
There are two teams. Attackers and Defenders.
When you join a team, you will spawn in a weapons room. There will be two rows of guns, and one row of explosives:
Select one weapon from each row, you will be pushed away if you try to take more.
Once the teams are ready, someone can push a button at the exit of the spawn room which will trigger the start of the match. The gates will open and you will be able to enter the map.
A timer will count down from two minutes:
If you die, you are out until the end of the round.
In a properly set up server, you will have no force other than heal, which you can use to regenerate your health between fire-fights.
If either team are all killed, the other team wins.
If the timer runs out Defenders win.
The Attackers must go to one of two bomb sites and hold down use to arm a bomb.
The Defenders should try to prevent them doing this until time runs out.
A bomb site
If the Attackers manage to arm a bomb a new 45 second timer will appear:
If time runs out, the bomb explodes violently, and Defenders loose.
If the Defenders die they loose.
The Defenders must attempt to defuse the bomb by holding down use. If they do this, they win.
If the Attackers are all killed, the defenders must still defuse the bomb to win.
At the end of a round, all players are returned to their spawn room, and there is a 30 second delay before the next round begins. I suggest that during the intermission, the teams switch, so that they have to play both as Attackers and Defenders. I suggest you play best of three rounds (first team to win twice) or best of five (first team to win three rounds) per match, switching teams every round.
Could be really cool. 
