Winning the award for most literal name, Shimo-Kitazawa Cage is a fenced-off cube under the Keiō Inokashira Line tracks. Get beers and snacks (from ¥400) from the Thai food kiosk and grab a picnic table. There are markets here a few times a month and other one-off events. The Cage is a temporary space and rumoured to depart sometime in 2019.
Shimo-Kitazawa Cage
Shibuya & Shimo-Kitazawa