Oh, that's a shame. It's bad enough to get a bad haircut, but worse when you have a big event planned.

If you are not cg, I would give your hair a good shampoo and then, yes, a DT with the best product you have.

If you are cg, then do the shampoo with a good cocobetaine poo and then the DT.

If your hair is fine, you might try a protein treatment before you DT. Don't try that if your hair is coarse.

Good luck - I'm sure others will chime in to try to help.

Congrats on your 20th Wedding Anniversary!!! - and have fun. Hair is just hair in the end - it usually grows back and in the meantime - focus on the good stuff - wow - 20 years.
2/c and some 3A.
Protein sensitive but can use occasionally
Highly porous. Color over grey.
Best 1st day method: Super Soaker
Stylers: Mix Curls in a Bottle into everything for shine. Terrible pj
Sometimes try roller sets - classic glamor but I prefer my curls.
Every day is a gift