The annual Erie Town Fair and Balloon Festival is the largest event organized by the Erie Chamber of Commerce. Besides ballooning, other highlights of the program include craft and food vendors operating from 10 am to 4 pm, stage performances at 6 pm, and fireworks at around 9:15 pm. All activities take place around Historic Downtown Erie and Coal Creek Park. It's only 28 mi (45 km) north of downtown Denver. Admission costs $5.
For the tickets and latest updates, please check with the official website (see External Resources below.)