ALTON. — Flock Food Truck Park & Bar will close Dec. 20, 2026, ending five seasons of food, music, and community gatherings at its downtown riverfront property, and will then prepare to transition to a new business.Flock opened in 2022, bringing together rotating food trucks, a full bar, live entertainment and community programming in a setting overlooking the riverfront. Its fifth and final season will continue through the closing date.Heaterz Hot Chicken announced on Tuesday, Sept. 2...