HAMMOND — Luba and Kire Obetkovski’s first visit to Purdue University Calumet made them feel right at home. The Crown Point couple, who are of Macedonian descent, attended the recent ethnic celebration Dobro Dosli, or “Welcome,” in PUC’s Alumni Hall. The program, sponsored by PUC’s Building Community through the Arts program, also highlighted the peoples of Serbia, Croatia, Slovenia, Montenegro …