When is the tiếp theo few Hatsune Miku concerts?

I miss the first one in SF because I was at Washington DC and the tiếp theo one in LA I missed because my sister said, "I didn't want to want to pay for something that should be fee. I mean we already payed for the convention." She made me so pissed,>.< that's why I need to know when the tiếp theo in America is!XD