Two things: past and future hiphop greatness. The past tonight is represented by none other than Jeru the Damaja, one of the top spitters of hiphop’s silver age (1993 to ’97). For those who do not know, Jeru released a classic in 1994, “Come Clean,” which was produced by DJ Premier. That classic can never be worn by time. On the side of the future is Porter Ray, a local rapper whose two releases RSE GLD and BLK GLD recall in many ways Nas’s Illmatic, another recording from the silver age. Porter Ray is very smart and has a flow that conducts that intelligence with great ease. See what hiphop once was and what it can be tonight. (Nectar, 412 N 36th St,, 8 pm, $10, 21+)