Originally Posted by Tommycat
Just all join a raid group. up to 24 can do it at once
Doesn't work that way... Raids (or "Operations" as they're called in TOR) are special scenarios for folks who have reached lv50 and have finished the main game.
The most folks can group together in the game outside of Operations is 4 players per group, so there will still be plenty of waiting in line.
Oh, and also, I think operations have up to 16 players in the group... I think, at least last I heard.