JR East Pass validity to Yunishigawa Onsen

Hi, I'm planning to go to Yunishigawa Onsen to visit the Kamakura Festival.
I read from japan-guide.com that JR East Pass is valid from JR Shinjuku Sation to Tobu Kinugawa Onsen Station. Is it valid all the way to Yunishigawa station?
Is it valid from JR Utsunomiya Station to Kinugawa Onsen station (or better still all the way to Yunishigawa Onsen?

Does anyone have the link to the latest bus schedule departing from Kinugawa Onsen and Yunishigawa Onsen (if possible in English). Which stop should I stop at to reach the kamakura site, or better still where I can see such view?
http://jto.s3.amazonaws.com/wp-content/uploads/2015/01/cg-events-kamak...

Thank you.

I read from japan-guide.com that JR East Pass is valid from JR Shinjuku Sation to Tobu Kinugawa Onsen Station. Is it valid all the way to Yunishigawa station?

No, only as far as Kinugawa Onsen Station.

Is it valid from JR Utsunomiya Station to Kinugawa Onsen station (or better still all the way to Yunishigawa Onsen?

Yes, but you need to transfer trains.

Does anyone have the link to the latest bus schedule departing from Kinugawa Onsen and Yunishigawa Onsen (if possible in English).

The blue box shows departures from Kinugawa Onsen Station in direction of Yunishigawa:
http://www.nikko-kotsu.co.jp/rosen/kinugawa.html

And these are bus departures from Yunishigawa Onsen Station in direction of Yunishigawa:
http://www.nikko-kotsu.co.jp/rosen/yunishikawaonseneki.html

The bus trip basics are explained here:
http://www.japan-guide.com/e/e3882.html#section_getThere

I think the last stop is closest to the festival site, but I am not sure.