There wasn't as much running around to do for my sister's wedding day, compared to how much we had to do for the mehndi night, mainly because most of the things had been organised and finalised months before.
We mostly spent the night before the wedding with family, joking around together, as well as just making final checks on things like the favour boxes (which we filled with personalised Love Heart sweets, pink and white heart shaped jelly sweets and various nuts and sugared treats), and putting together the guest book (with a baby picture of both bride and groom!) We also spent the evening pampering (or trying to!) and doing last-minute things like putting on nail varnishes and arranging our bangles - and not getting a lot of sleep! :)