Welcome!
Unfortunately no competition will be held in June, although there will be two competitions in July, as announced at WCA.
There are two cube meetings in Sendai (June 7th) and in Fukuoka (June 14th, I will go).
If you're interested, please let me know.
EDIT: Which city will you visit? FYI, I heard that Collin Burns will come in June, staying at Kobe.