According to this web site http://tinyurl.com/z3y1 (if my high school Spanish serves me correctly), San Vicente Ferrer is celebrated during the 8 days following Easter Sunday (on April 11th in 2004).

I was not able to find the starting and ending times of the battles of the Moros and Cristianos in Alcoy but there is an email address on this page http://tinyurl.com/z3yp to which you might try writing. Good luck tracking down the info you're seeking.

Cheers! Linda