Fiesta de San Sebastian in Diriamba

I am trying to find out more about the Fiesta of San Sebastian in Diriamba. All I know is that it is from about Jan 17th thru Jan 29th, but I can't find any more specific details. I'd like to go there at a time when I can see the colorful parades of costumes, so I'd like to know which are the best dates for this. Also what is the best way to get there from Granada without a car.

That festival is a big one I hear. I think just about any festival around the villages of Masaya are worth going to see.

There is a guidebook coming out that covers all of that: nicaconexiones.com/ncx-guide-to-festivals-and-events-in-nicaragua/