Every Saturday evening in July and August, ARTIS stays open until sunset for its popular Summer Nights. The zoo takes on a completely different mood after the day-trippers leave — quieter, atmospheric, and beautifully lit. Students from the Conservatorium van Amsterdam play live acoustic jazz in the music tent from 19:00 to 20:00. You can picnic on the grass, watch the animals in the evening air, and join optional guided tours of the park. Food stalls serve vegetarian options. Entry requires a ticket (or ARTIS membership); children under 3 are free.