The Custom Hotel has made visiting Westchester — out by LAX and the 405 — a surprisingly chic prospect, especially when it's for Custom Sundaze, a weekly poolside DJ party. Jon H of the renowned Fort Knox Five gets behind the tables this weekend, bringing the group's brand of high-energy electronica that fuses hip-hop, breakbeat, and jazz. FK5 have become sizzling hot in recent years, leading the illustrious Afrika Bambaataa to tap the DC-based outfit for his most recent album. Though he's played his fair share of arenas and clubs, Jon H probably won't mind trading the spotlight for the sunshine.