DJs Casper and LeSage of Ol’ Dirty Sundays have put their tune-filled heads together again and the result is this day of island vibes and culture held on the outdoor patio at Martini Republic. From 2 to 8 p.m., DJs Blenda and Shafiq spin all-reggae 45s in between sets by Bay area groove and sway purveyors Tribal Style, Badda Skat and Rocksteady@8.