http://eatmore2weighless.com/the-metabolism-reset-guide/
Have you read this? It's very straightforward info.

If you are thinking the 1 lb gain in 1 week in anywhere near valid math to do something with, then that would imply 2200 is 500 calories over true TDEE, and that means 1700.

Which means you should have been gaining ever since eating above that number. But you weren't.

Of course when you lay out the logic like that, you can tell that can't be true.
Let's say even 1/2 lb. or 250 cal over TDEE.
That would mean 1950.
Reasonable?

No. If you think these jumps contain any amount of fat, do the math to see what implied TDEE would be, and did eating level and weight change bear that out truly.

Yes to the wedding for water weight gain, for sure.
Just be glad you weren't a bridesmaid dieting all week to fit in a dress, and then enjoying the eating at the reception - and the scale the next day.

Should you stay at 2200 for another week or so to see what happens? I know what ya mean when you said it's hard to find tdee when you 'gain water.' I'm kinda having the same problem.

Alcohol is known to have a whoosh effect on retained water.

Which would be good, usually don't gain that back as body really didn't need it anyway.
Sometimes a high carb day or two will do it too.

Glad to see it back down. I'd increase. Extra 100 cal even if over true TDEE is only 0.2 lb gain.