You mean the Halls of Justice world boss dailies? There are people setting up groups for each of the individual quests 24/7. Sometimes they'll stick around for more than one, but usually they break and reform.
Pay attention in zone chat for someone saying "LFM dubdil/wuyuvus/sulipund/etc, have quest to share." You basically have to turn off zone chat in order to miss them.
Once you're in such a group, don't forget to ask if anyone has a delve daily to share as well, if you're after the motif.