Hmm, I see raids forming in Imladris all the time, and participate in quite a few myself. Have you joined the GLFF channel? That's where you find a lot of people trying to put groups together; far more frequently than in the regional channels. Also, if you are not in a kinship, that's the best way to meet people to group with. If you are looking to do 12-man raids all the time, you'll want to join one of the bigger kinships or a raiding-focused kinship to ensure that there is the population base to support this (not all kinships are into raiding or are very large).
Galadhloth, Hunter 100, Glirithil, Mini 100, Calanor, LM 100, plus lots and lots of alts
Watchers of Elendil ~ Landroval ~ Crickhollow ~ Tarciryan Knights
~~~~ Imladris in the Forgotten West ~~~~