Lamplighter’s original brewery and taproom sits on Broadway in Cambridge, an easy walk from Central Square and MIT, and once a month — on the first Saturday — it opens its production floor for a guided tour and tasting. Staff walk you through the essentials of how their inventive beers get made, from grain to glass, while you sip your way along: a welcome pour to start, flight-sized samples as you go, and a bonus beer to cap the lesson.

The whole thing runs about an hour and lands somewhere between beer geekery and comedy hour — there’s even a playful quiz and a diploma at the end. It’s 21+ with valid ID required, and space is tight, so book ahead. Perfect for the craft-curious, visiting friends, or anyone who’s drained a hazy IPA at the taproom and wondered what happens behind the wall.