Oh, seems like the DP side will ask for you to participate in Blaze Cloud and Elemental Battles. I think Elemental Battles are just the bog standard regularly scheduled PVP matches? If it's just a matter of participating, shouldn't be hard beyond fitting in your schedule (ok, bit harder for me right now). If it's a matter of winning, then it's a question of whether your opponent is active or not... :P
As for Blaze Cloud though, ehhhh. Blaze Cloud can be both time consuming and luck dependent. Think of it as kind of similar to raid fights here; big boss fights that other people can join in. I really hope that it won't require farming the highest difficulty of boss fights, as those are outrageously durable (and/or I have no idea what I'm doing). In the past, I've tried soloing the highest difficulty, spend nearly an hour, and still not come close to killing it on my own. Better to furiously refresh the list and jump in on other fights that you can see are making progress :P
(and I can solo the 2nd highest difficulty with no problem, IIRC)