We just found out that Dallis Coffee, which has been roasting beans in the city for more than 98 years, is offering a tour of their offices at 100-32 Atlantic Avenue in Queens this Saturday from 1 to 4:30 p.m. We profiled the roaster and their little-known history (they’re the guys making coffee at many of the city’s most prestigious restaurants) in our May-June issue. The tour is $10 — you get a pound of Dallis coffee, too — and includes coffee history, how they roast, the origin of their beans and a cupping (the fancypants coffee term for a slurpy tasting) of some of their newer finds. You just have to RSVP at orders@dallisbroscoffee.com or 718.845.3010.