Hmm. Wow. No. I didn't know PDO has a calendar. I'll go find it and play with it.
Hmm. Didn't know Dance Forums has a competition calendar either. I just checked it. It looks like it's populated out for the next several months, at least, but I can't tell if it's comprehensive. I'll look at it more in depth later.
And yes. I can see that it's a thankless task, with lots of room for error and the need for constant updates. Lots of work.
Not sure I'd volunteer to do such a thing. Hence my desire to link to everybody else's. *grin*