Read the menu, order as a group, and maybe hold off on “surprise me” during a rush. Here’s what the people behind the bar wish you knew.Back view of a man ordering drink to a bartender.Credit: Drobot Dean/Adobe StockMost bar etiquette mistakes aren’t dramatic. They’re small habits: asking questions the menu already answers, calling a bartender over before everyone is ready, or making an open-ended request in the middle of a rush. Each one can ma…