For lost and found items at SUMMER SONIC Tokyo, please contact the following

Makuhari Messe General Management Center: TEL 043-296-0531 (24 hours)
ZOZOMarine Stadium Management Center:TEL 043-296-1227 (09:00 – 17:00)
If you lose your credit card, driver’s license, or other valuables, we recommend that you contact the police or a financial institution immediately.