There is a fair chance that there will be girls on your do who won't know each other, so this can be a bit awkward at first. So introduce everybody to each other by giving each of the girls one of these adhesive name tags, which has space at the bottom for everyone to write down their name.
This can also help to avoid the potential situation after a few drinks if a couple of the girls who have met for the first time on the night have forgotten the other girls name.