The folk-rock twosome of Neal Shulman and Rex Fowler are currently celebrating 40 years of musicmaking, and fans have two chances this weekend to catch these guys in Central New York concerts. First Aztec Two-Step will visit the Auburn Public Theater, 8 Exchange St., Auburn, for an 8 p.m. show on Friday, Feb. 18. Tickets are $23; call 253-6669 for details. Then the duo swings over to the Utica area for another 8 p.m. gig on Saturday, Feb. 19, at the Munson-Williams-Proctor Institute’s Root Sculpture Court, 310 Genesee St. Sharing the Utica bill will be the Jon Pousette-Dart Band. Ducats for the Utica performance are $30 for adults, $20 for students. For MWP information, dial 797-0000.