Nycfc-red Bulls Derby: Adding To The Metro-area Tradition Of Rivalries!

The Cross River Rivalry
The river will run red, with Ron Burgundy's blood!
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Question here. Haven't followed the MLS at all until now, how is it formatted? Will NYCFC and NYRB play 2 times a year, at each team's home stadiums? Or one game a year that alternates home and away every year?