Solar calendar has nothing to do with Islam. The 9th month of
Hijra calendar - Ramadan - is the month during which the Muslims
keep fast. Between 8th and 13th of the last month of Hijra Calendar
the Muslims perforn Hajj and on the 10th of this month they
celebrate Eid-ul-Azha.
In terms of the United States, there is a hoax that President
Obama declared November to be Muslim Appreciation Month in the
United States. This is not the case. It was a story in a satirical
newspaper that people took too seriously.