No. It's a 2½-hour show but it's site-specific in a restaurant environment (whether that's in a theatre, arts centre, hotel or not), so you can get up at any time you like. However, a third of the show is scripted, so it's best to get up only at the end of individual courses.
For drinks service, it's best to order enough before the show to be delivered to your table through the show. However, there are opportunities to order drinks during the show, eg after the main course. All drinks are table service only.