If you want to help OTHERS get 2000 dp and 3 medallions of Dol Guldor from the Sword Halls hard mode repeatable challenge very easily just do this:
1. Beat SH HM
2. Loot the chest
3. Leave the instance and have ONE or TWO person's/people that IS/ARE NOT the leader drop. DO NOT DISBAND
4. Leader invites one or two others to fill the group.
5. Everyone enters the instance. The two people that had not already completed SH HM for the day will get credit (2k dp + 3 medallions) and are free to drop for two others to come in and get their bonus!
NOTE1: This also flags the deed as complete and the quest complete WITH NO WORK needed by them
NOTE2: This works in MOST BUT NOT ALL Moria and Mirkwood instances but because SH HM is the quickest. I am posting this for it.