Oh Kara!!! When do things calm down for you with holiday stuff? Hopefully this is the end of things this weekend and you can get back on track!
FWIW after a week or so of sorting things out, we have finally fallen into a routine again. Wake at 700, nap 12-2, bed at 730. Actually, it's probably closer to wake at 650, nap at 1210 most days, and he's doing close enough to a 2 hour nap for me to be satisfied. The days that he only sleeps 1hr45 and wakes by 145 he still will not go to bed until 730 - making me think that body clock is having a lot to do with it. And, he's not sleeping any later the next morning, which does get me worried that the little bits of 15 minutes here, 15 minutes there will slowly build on him, but I am trying my hardest to not worry about those until it DOES happen.
I don't really know how we got on to it. We did have quite a few days with what I consider early wakings, though not technically EWs -- 615, 620ish, and he was refusing to nap until 12 anyway. As the wakes got later, he still wanted that nap at 12, which made for long mornings but after two days of sleeping 12 - 230 he sorted himself out I think. What is still bothering me is that every morning at 10ish he starts yawning and acting tired but will NOT NOT NOT nap. We do 15-20 minutes of quiet story time together and some days he "asks" to take his books to his cot by himself for 10ish minutes. The quiet time seems to revive him enough and push him to the afternoon.
I hope last night was okay for you....wondering if you can just stick him on a set nap time, I don't remember if you've tried that or not? Or start with a set bedtime and see how it goes from there?