IN PR we need very little to throw a party of any kind, even your dog birthday will do. There is a parade in Loiza but I have no details, I would suggest to check the newspaper, there should be something about it.
There is also a celebration and parade in Guaynabo, some details below (Spanish): (Spanish What to do with kids site)
San Patricio Plaza
SF. D. Roosvelt
Esq. Avenida San Patricio
Guaynabo, PR 00968Â Â
787-450-7686Â Â
(Bad link)
Free and for the entire family
Here is a Facebook entry about the parade also:
This one (In English) refers to a parade in Luquillo, but it may possibly be the same as the Loiza one. Here is the link.