I have solved most of the clues but am lost on the theme (and what the missing letters spell out).
I see that 7a&20a have a link and similarly 7d&20d. Am i right? Also, are we in the right season for a festivity re 7d? Although I'm not sure if that means the theme is related to the character at 7d. Anyway for either of these pairs, I cannot see what 17a is.
I see a clear ambiguity for 15d. But, not sure what the other 3 would be. My answer for 16d is fits the definition (1st word of clue) and the outer letters are clear (last 2 words of clue) but the middle 3 letters i cannot see from the wordplay. I assume 16d might be one of the ambiguous clues.
For 27d, the answer seems clear but I'm lost on the wordplaym. Oops, I mean wordplay.