Macomb, IL – The colors of the rainbow will be aglow in the skies over Macomb this weekend. The 19th annual Macomb Balloon Rally will be held Friday and Saturday. This year's theme is the Macomb Monster Mash. Balloon pilots will try to hit a Halloween-shaped target with styrofoam skulls on Saturday. In addition, the popular balloon glow will be held Saturday night. The hot air balloons will light up Vince Grady Field beginning at 7:30 p.m. 29 balloonists are expected to participate in this year's rally.