"Our annual SomerMovie Fest is back with free, family-friendly films starting just after sunset! Showings are scheduled every Thursday evening at dusk from July 5 to August 23. Screenings will take place at different locations around the city..."
The August 16th movie is "The Incredibles" (2004) and will be shown at dusk. 7:30 is simply a recommended arrival time.
Seven Hills Park, Davis Square