The Vondelpark Open Air Theatre runs a free program from May through mid-September, with around 150 performances across the season. The stage sits in the heart of Vondelpark and hosts music, dance, comedy, theatre, and children's shows, drawing around 100,000 visitors a year. No tickets needed — just show up, find a spot on the grass, and enjoy. Thursdays tend to be classical music, Fridays dance, Saturdays cabaret and theatre, and Sundays a mix. Check the agenda online for the full lineup.