With openraid you can either use the chat feature, or try sifting through the events and plan a couple nights in advance. With the planned in advanced runs you can usually get by with a lower itemlevel by proving to the leader that you have intelligence.

My 550 druid was getting passed up for groups while 2 separate characters have heroic garrosh on farm. I used the event feature and got a group for 2 nights later pretty easily.