A lot has happened for HBK Gang, the eclectic East Bay hip-hop collective, in the past year. Kehlani’s debut album You Should Be Here landed her a FADER cover and garnered her a national following; Kool John and P-Lo’s collaborative album, Moovie!, solidified their status as a rapper-producer dream team; and Iamsu! is getting ready to drop his next album, Kilt3, and go on his first-ever world tour. Celebrate with the gang on Heartbreak Halloween, a two-night concert at The Warfield in San Francisco, featuring the above-mentioned artists, plus Sage the Gemini (of “Red Nose” and “Gas Pedal” fame), Skizzy Mars, Jay Ant, Skipper, and other artists from the crew. Because the October 30 show sold out quickly, the venue added an encore on Halloween night. The official after-party (and Kool John’s birthday celebration) takes place at Roccapulco (550 Barneveld Ave., San Francisco) at 10 p.m. on October 31 and will feature appearances from HBK members and DJ sets by Daghe, Noodles, and Aux Cord. Suggested costumes: a tsunami (in honor of Kehlani’s girl crew, Tsunami Mob), a red-nosed pit bull, or the Shmoplife happy face.