I did this on four different teams of mine in the last two days (thanks to RAF I got 19 toons to 60, now moving them towards 70). I soloed one of the teams through the first four guys, died once on the fifth, then decided it would be nicer to help others and easier for me as well.

I just looked for teams forming in general chat - every 1-2 hours a team will form of random level 65-67s in the zone. Just message their leader that you'll meet them at the Ring and help them if they'll then stay around and help you. All the fights are trivial with 10 players. People realize they are very hard with five and will readily agree.