Hi LDL,
the 72 and 42 can be done anytime as they are devestating to the enemy. I know HP HC has said to take a few days off the Ritual schedule though if you want to keep doing some, the 72 and 42 are choice. And that new Ritual's are forthcoming, and he will post them soon.
I haven't seen them yet....I just checked and no, don't see any yet.
http://www.angelfire.com/ wizard/pixie666/RTR_English. html