It all depends on your type of hair and where the wedding is going to take place. If its outside and you know you have hair that puffs with the slightest whisp of humidity ...then do NOT wash it the night before..unless you plan on using A LOT of hairspray. nobody likes the crunchy look :(
You should def wash it two days before the wedding. Now if the wedding is inside.. its up to you. Id still play it safe with the two days.
Your going to be dancing and having fun.
Conditioning should be no problem. Prevents frizz.

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