Dresses, corsages, tuxedoes and limousines. Photos, dancing and dinner. Long a rite of passage for high school students, the annual tradition that is prom season has arrived.Starting Saturday with South Forsyth, the county’s five public high schools will hold their 2013 proms over the next four weekends.“[The students] get caught up in being a sophisticated adult for an evening,” said Vanessa Behler, teacher and prom sponsor for the past nine years at North Forsyth High.