Quick Hit: Attention high school sports fans: have you always wanted to see the big game under the “Friday night lights” in stunning high definition? Well now you can. MSG Varsity, Cablevision’s high school sports network, is going HD. The HD feed will go live September 7. To coincide with the switch, the network is launching a series spotlighting a weekly Friday night football game between New York/Tri-State area area high schools.