3 month calendar that updates automatically.

I'm trying to build one of those calendars where you can select a month and year and it'll show you the next two months as well. But I can't get the consecutive months to update.
I attached a copy so you can see what I'm trying to do.
Ideally, I'd like to select the month and year from cells B3 and C3 and have all three monthly calendars update.

Thanks.