The cache is located at the listed coordinates (Tomodachi Park near Hikarigaoka Station), but you need to complete the challenge before you can log a find. The challenge is to attend 10 Geocaching events in one year (calendar year). You can include any type of event (including CITOs) and even events that you have hosted by yourself. Besides, you don't have to find this cache in the same year you have attended the events.
Please use the linked challenge checker to confirm that you have completed the challenge.
Please also note the terrain rating of this cache. Don't attempt to retrieve the cache if you don't feel confident that you can put it back! Bring a tool or come together with a friend.
Proof that bokujo has completed the challenge:
I made it with 11 finds and needed only 10 of the type Event Cache Cache In Trash Out Event Lost and Found Event Cache Mega-Event Cache Groundspeak Block Party Giga-Event Cache Groundspeak Lost and Found Celebration
gccode visitdate cache_name
GC72X9X 2017-04-13 Dönerstag 2017 in Shibuya
GC71ZRR 2017-04-13 Waggeldaggel meets Hachikō
GC73AW1 2017-04-22 CITO Weekend 2017 on YHR3
GC73HH0 2017-04-23 UN English Language Day
GC7835T 2017-07-16 Let's Meet up, Cap'n!
GC782V2 2017-07-20 Meet & Greet at Tokyo,Japan 東京、日本でドイツ人とスペイン人を迎え、挨拶
GC7A6X8 2017-08-25 Meet and Greet - Mit minzfrischem Atem
GC798G1 2017-08-26 Cachen im Mais V
GC7CEWX 2017-10-01 CITO at Arakawa / 都民の日 荒川CITO
GC7CANJ 2017-11-05 GIFF ＆ BBQ in Syowa Kinen Park 2017