Activity for Alexis

So I've not done this before, and I'm so lost. We're going to the airport immediately following the reception and I don't know if I'm allowed to stay in my dress? Should I change? How do I find another dress that looks nice, but can also be worn more...

My FH and I have zero idea where to start on budgeting... our parents either aren't married or went bankrupt in a wedding. Family hasn't really helped. What have you guys done?