LOREN BARRIGAR AND MARK MAZENGARB — The international guitar duo of Loren Barrigar and Mark Mazengarb met at a guitar camp, played together, then met again four years later at another convention. A partnership formed, and the duo has since recorded an album of guitarbased folk rock. They will perform tonight at the 324 Ballroom in Fayetteville. Admission for the 8 p.m. show is $15. Reservations can be made by calling 409-1224.