Bro, you have internet. so how it will be hard to know that. you can search in the Google for every thing that you need to know. Google will provide you every thing that you need always as like i get every thing from it.
Thought I am newer in Forex, But I think you can not able to know the exchange rate on those day. But you can get the exchange rate in those country where those day are not closing day.
if you want to know exchanges rate during holiday you can use or search online then i think you get huge online live currency rates sites they show you forex market currency rate easy way.