Can't think of anything. Maybe a purse pack of perfume. Powder.

Cab voucher. Or whatever the Uber information is nowadays. I presume you and your husband will be celebrating the wedding properly? ^(🍻🍻🍻🍻🍻🍻🍻🍻)^ Maybe an emergency bottle of tabasco sauce for your husband (just in case).

Safety pin, bandaid, headache pill

Ibuprofen, 1/2 hour with food before you git down on da d-floor and show everyone how it's done.

You sound well prepared, nothing to add, have fun!

Might save someone's night with a little sewing kit or a tampon. A hip flask of good booze. A museli bar.