These are the events I was thinking of hosting:
Cat-And-Mouse @ the market of Queen's Port
1/4 of the participants would be guards
1/4 of the participants would be smugglers
2/4 of the participants would be civilians at the market.
It is the guard's task to find the smugglers carrying illegal goods (named item). They know IC that there are smugglers at the site.
It is the smuggler's task to pass through the market undetected and deliver the illegal goods at the other side.
The concept is:
Smugglers would have to rp their behavior. They might be nervous, sweating, grinning, keeping up appearances, etc.
The guards would have to rp how they go about finding these smugglers: Check everyone, check a few, patrol, try to guard every market stand, etc.
Prison Break @ The dark triangle prison of Aeroch Nor.
1/4 of the participants would be guards.
3/4 of the participants would be prisoners.
1 person would be head of guards / prison owner.
It is the prisoner's challenge to try and escape, over the course of an hour, using whatever methods they like (trickery, killing, befriending guards, etc.).
It is the guard's task to keep the prisoners in check and make sure they follow orders and do not escape.
The concept is:
The dark triangle prison consists of several separate holding cells, but also one big pit in which a lot of prisoners are kept together.
In this pit, they have a few spots out of sight of the guards, where they could make up an escape plan.
There are multiple ways out of this pit, but only 2 ways out of the entire prison.
Free-for-all @ any arena (thanks Cymic_ for this idea).
All the participants that like to do combat enter the arena and take their place.
All the participants that do not like combat may cheer or throw tomatoes (snowballs) from the side.
The prisoners will have basic weapons of choice out of three categories.
Categories could be: Shield-and-sword / spear-and-net / double-wielding-axes
The concept is:
An all out fight to the death. It are temp-characters, so hopefully people do not get too attached to them.
Anyone may attack anyone at any time. I expect the first few to fall pretty soon. In the end, last man standing wins.
PvP event @ Sanardú
1/2 of the participants is in the defending team
1/2 of the participants is in the attacking team.
The defending team is all the way up at Fuvur mansion and will have to make sure no attacker enters this building, or they'll lose.
The attacking team is all the way down at the docks and will have to make their way to the top to enter the Fuvur mansion to win.
The concept is:
Depending on OOC or IC nature of the event.
OOC: The region owner turns PVP on in the region and the participants may choose of a few classes, of which the armor and weapons will be made available.
The defending team can station people all through town, at the gates, at the mansion, at a square, on roofs of buildings, etc.
The attacking team takes a laid out route through town, marked with for instance: purple blocks.
IC: Participants may choose of a variety of classes to equip themselves with armor and weapons. The same as OOC nature of event, only this time they RP every conflict. This variety is less of a minigame than the other.
Capture-the-flag @ (....)
1/2 of the participants is in team one.
1/2 of the participants is in team two.
Both teams have their own base and the players of each team need to set a home at their own base (for when they die to respawn).
The concept is:
Both teams need to capture a flag in the middle of the map (a bright block that can be equipped as head and taken from a minecart-chest).
Once the flag is taken, the team must bring it back to their own base. First to 3 or 5 points wins.
Anyone may take any of these ideas and credit me for it with a tag if they are going to host it.
I know I am not.
This should get me back into RP! 
