Probably TMI, but the state publishes a ZBA handbook with all the procedures that must be followed. It can be highly stylized and formal. Or see their FAQ. If you google videos of "zoning board of adjustment meetings" there are plenty of examples. (But probably boring, if not your town.) If you are an abutter, you get noticed by mail, and definitely be given a chance to speak. No, you can't ask the owner questions directly. You have to address your questions to the board chair, but you will get a response. Pro tip: find the minutes of the planning board hearing (or video if your town records meetings), to find out why they need a variance. -a local ZBA member