I have a few Event Idea's :-/
1:Hide n' Seek
Some person goes in the mines or something, and hides in a barrel or something The participating people should search for the hider. The nice thing is that people with +2 speed rings or something can still have a hard time.
Suggested Reward(s): A scroll of Stealth or Thieves Ring or "Seekers Ring" that has speed+1 wis+1 and dex+1 but con-1
2

iamond Mining Tournament
Try to mine up as much as possible diamonds* in a certain amount minutes. You will get a reward for each diamond.
Suggested Reward(s): 1 Diamond - Woodslore or another scroll
2 Diamond- Medium Spell/Prayer/Ring of your choice 3 Diamond - High Spell/Prayer/Ring OR Low spell/prayer/ring +100 plat
4 Diamond - 500 Plat OR +1 Speed +2 Cha Ring
5 or more Diamonds = +1 Speed +1 Con +1 Str Ring and 500 Plat
3:Seek Quest
The events staff hides a scroll in a building/ship/dungeon and the players get 1/2/3 hints on where it is. The scroll contains 1/2/3 hints on a bury bag, that contains the prize. There are teams, and all participaters get a diamond anyways. The price is split up by the winning team.**
Suggested Reward(s): A diamond for all participaters + 100 plat per player from the winning team AND a +1 Speed Ring for the one who digs up the right bury bag.
*This can also be other ores
**The quest can also be longer!