Most major rock/pop concerts - Thai and inter - hire the 12,000-seat IMPACT Arena in Asia' vast complex. Book via Thai Ticket Major (www.thaiticketmajor.com). Challenger Hall, the world's largest column-free hall, also hosts Fat Festival (early-Nov) and its trade fairs' public days draw bargain hunters. GEMS (late-Feb, mid-Sept) deals in jewellery, TIFF (mid-Mar) focuses on furniture, BIG (late Apr, mid-Oct) features design, housewares and gifts, THAIFEX (mid-May) does food, and BIFF exhibits Thai fashion (Aug). Though distant, its fast to reach by expressway.