Some ideas for events...if someone has more share them:
Fight Night! - PvP, dueling, and unarmed combat.
Trade Fairs - a gathering where individuals bring materials and items they've crafted to assist friends and other players with new armor, weapons, items, and enhancements.
Fishing Trips - Pretty straightforward, but a great way to level fishing up. Can be made into a contest as well.
Costume parties - it's always interesting what people can put together.
Debate Night - New topics every week!
Speed Dating - Not only for those looking for that special someone, it's a great way to get to know friends and allies.
Fashion Show - Put on your best outfit and show it off, or have a sponsored event for a tailor in your guild! Works really well if you can collect a number of Moonstones to use for spotlights.
Campfire tales - Gather around the campfire in Thunderbluff and have people share stories
Date Auctions - A great way to raise money for a new guild bank tab or other event you plan to host.
Skydiving - Been to the Twin Colossals in Feralas? Free parachutes for those who go to the top.
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Jumping
Racing
2v2
Dodging
Stairs
Global Race (Doesn't require a location as much)
PvE outdoor instance
PvP