Since you have 7 days, I would do (in any order):
NYC: see the Radio City Christmas Spectacular, go ice skating at Rockefeller Center, lots of other fun stuff to do.
Bethlehem:
https://www.discoverlehighvalley.com/cities-towns/bethlehem/explore-bethlehem-during-the-holiday-season/ and if you want something less stressful than NYE in Times Square, PeepsFest in Bethlehem could be good if you can get tickets)
Baltimore: Miracle on 34th St
https://www.christmasstreet.com/ , B&O Museum Holiday Festival of Trains, and maybe the Walters or other museum and the aquarium. Eat at Miss Shirley's