I had not seen the rainbow fireworks before last night (left in the photo). The Sugarhouse fireworks had some other novelties, like fireworks that expanded outward into a star pattern. Great show, and afterwards for about 4 blocks, 1500 E was filled with pedestrians, no traffic control, a dark street, but a happy crowd, just very unlike Salt Lake City.
Three sequential exposures, f14, +6 seconds each. ISO 100 (or the L-1.0 setting on the D700), blended together in Photoshop using the lighten mode.