I *may* be going to TDL this june (or maybe july) [I am very excited] and I am wondering: when during this month would be the best time to go crowd wise? I want to be warned of any holidays ahead of time to avoid crowd.
You should be safe for the entire month of June and first few weeks of July, as the kids will still be stuck in school. Although Tanabata (Star Festival) will take place between 1st to the 7th of July, which may bring in bigger crowds for this short event, but bare in mind its not considered a National Holiday. You also should take into consideration that June is also the rainy season, so while it may bring in less crowds, it will also likely lead to many cancelations.