Looking for nice guild QuestsFollow

Hello,
I am new to this side and i must say its amazing !!

I play on a germane server and i am planning to organize a "Guild-Event" for all members.
So i am looking for some real nice quests. Expe don't matter. We just want to have lots of fun. This should be a "Guild-Party-Day" for every one, so what quests can you prefer me? All members are at level 20 + (and it is no problem to mentor).
We just want to make something "unforgettable" together.

I would be very thankful if someone could give me a hint what to do!!

Thanks a lot !!

Regards
mackfried

PS.
Please excuse my bad english

You don't have to wait until the end game to raid, there are Epic encounters going as low as the Windstalker Rumbler, level 17 Epic X2. Most dungeons have named and epic encounters but if they're not instances you'll find a lot of people camping them. I'm not sure what level they start at but there are city raid writs for guilds. I think they may go as low as level 20. See City Taskmaster(?) Fowler in Oeynos Harbor or his counterpart in Freeport.

A couple ideas for guild events might be having everyone get together and complete a Heritage Quest or 2. The shiny brass Halberd in Nek, Haddons Earring and the Polished Brass Tomahawk (both in TS) don't involve camping rare spawns so you can do them in fairly short order with multiple groups. You could have everyone get writs and grind them out together. Your guild benefits with those things as well, raising your level. I've heard of guilds having a harvesting day to get raws for their crafters, and you let people keep their rares so your appropriate level crafters can make items for guildies and get more exp for themselves.