BOMBS BURSTING, ETC: Happy Independence Day! Grill up some zucchini, down a beer or three, and enjoy your day off. Ivars is doing their exploding chemicals thing after sunset, so if you're into that, sedate your dogs/chickens/goldfish and enjoy the 23 minute show over Elliott Bay. Or wherever: check here and here for your options. 10 p.m. // Your Roof // Free(dom) GANGSTA RAP—SERIOUSLY: Get your gangsta self to Chop Suey on Saturday for Crooked......