orz it turns out that I am pretty late with my reply too... m (_ _)m
I have just checked the movie website and it seems like they only have one show in Kyuushu in late August. Oh well. Now I can only cross my fingers for the DVD release.
You certainly have great parents who are willing to travel with you to Japan . I have to go into great extent to avoid オタバレ to my family and relatives.
As far as they are concerned my favourite is still Doraemon (It's okay to like kids cartoon here, but not the late night ecchi shows) . The language barrier is a great advantage to me. I watch Mitsudomoe on my family TV and everyone thinks that it is just another boring Sunday Morning kids show.
Talking about オタバレ, the worst I got was a friend who searched my bag for fun retrieved a copy of 電撃大王, and showed it in front of two other friends of mine. He couldn't stop laughing and teasing me for the whole day, but at least they were decent enough and didn't mock me in front of my class.
Even if you pretend, it doesn't change the fact that Mato is 12 at most and it makes things very wrong ^^'''. Plus Death Master would certainly appear in your dreams and chop off your head repeatedly if you had any dirty thought involving Mato Σ(； ﾟдﾟ).