BOCA RATON, Fla.— Rosenbaum Contemporary is presenting Immediate Geographies, an exhibition of oil paintings by German Contemporary artist Thomas Hartmann. A special preview of the works will be held at Rosenbaum Contemporary’s Miami gallery inside the St. Regis Bal Harbour Resort, 9703 Collins Avenue, in Bal Harbour, Fla., on Oct. 2 from 7 to 10 p.m. The main exhibition opening will follow at Rosenbaum Contemporary’s Boca Raton gallery, 150 Yamato Road, Boca Raton, Fla., on Oct. 3 from 6:30 to 9 p.m. The artist will be present at both events.