COCKTAIL HOUR DECISIONS
Will there be one?
Will the kids be in the same room as the adults during this time? If not, who will supervise the kids' activities? Common choices include assigning or hiring college-age kids or relatives to oversee things; others have the DJ's dancers do it.
Do you want a separate sound system for the kids' room?
Will games be played with the kids during the cocktail hour?
If so, do you want to include a trivia contest about the bar / bat mitzvah celebrant?
PARTY TRADITIONS
Will there be a first dance with parents?
If yes, what song and artist?
Will your party include the performing of a motzi (blessing over challah)? If yes, by whom?
Will your party include a candlelighting ceremony?
Do you want a hora played? If yes, will the bar/bat mitzvah celebrant be lifted in a chair? Will siblings or parents?
Once you've settled on the answers to all these questions -- and it may take some time -- be sure to convey them, verbally and in writing, to your DJ/MC and/or band leader as well as your party planner (if you're having one).