20 man instances..

[Knabbel]

Maybe this could be of a little help

GuildEventManager

It is the GuildEventManager add-on. You can schedule raids ingame....

Description :
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This AddOn allows you to create/schedule/manage future raid instance directly in-game. Players can register (join) and reserve a room for your instance, or cancel subscription.
You can setup a maximum players for your event, as well as the min/max per class.
When a player wants to join and there is no room left for his class, he is put in a *substitute* queue, waiting for someone to cancel his subscription.

The leader of an event does not have to be logged in for a player to subscribe.

This addon has been designed to help guilds to schedule events, and its member to say *I'll be there*, and count the number of players that are ok for an instance.
It does work for multiple guilds (kind of Alliance of guilds), if you want, or even with your friend list.

All dates are stored in universal time, and displayed in local time, so if someone creates an event in a different timezone than yours, you will see the correct time on your side.

[kregoron]

GEM is nice addon, but is has some bugs, we used it in my old guild and a lot of times we had people signing up where there were free spots left and they still didnt get a main spot but got backup spots and then other signed up later and got the main spots.. it is a very bugged addon which im affraid wont help much, just make more props.. And we have people who dont like to get to much addons in so they would be force to use addons just to raid... which i dont like.. But thx for the suggestion knabbel

[TeaLeaf]

That's my concern - and it also needs updating after every WoW patch

The Officers are however currently looking at a web-based options as part of a wider review of raid attendance etc.  This might solve the problem in a much more relible way.

TL.