SunShion (+ BND + ZB1) -- Rancho Cucamonga 2026

“Three fandoms in one afternoon. SunShion celebrates Sunoo's birthday, BoyNextDoor's…”

Three fandoms. One afternoon. One of the most packed cupsleeve events in the SoCal K-pop calendar for summer 2026.

SunShion celebrates Sunoo's 23rd birthday, BoyNextDoor's 3rd anniversary, and ZeroBaseOne's 3rd anniversary — all in a single afternoon at Rare Tea in Rancho Cucamonga. Organized by Moonstruck Fantasy, this is a cupsleeve tier pickup and photocard trading celebration where Engenes, OneDoors, and Zeroses all show up in the same room.

What is a cupsleeve event? Fan-organized celebrations where dedicated K-pop supporters design custom cup sleeves, freebies, and merchandise for their favorite idols' birthdays and anniversaries. They're distributed at local boba shops and tea houses — a format that started in Korea and is now the heartbeat of North American K-pop fan culture. This one brings three separate fandoms together in a format that rarely happens at this scale outside of KCON.

If you pre-order your cupsleeve tier in advance, you're guaranteed an item. Walk-ins can still attend, browse, and trade photocards. Free parking at Rare Tea. All ages welcome. Doors open at 2 PM and the event runs until 6 PM.

This is the K-pop social experience that exists outside the arena — the community behind the fandom, gathered in a tea house in Rancho Cucamonga for four hours of boba, trading, and shared obsession.