Here's a brief description and video of las fiestas de San Sebastián, or how we call it in Puerto Rico: las calles
In my opinion, las fiestas de San Sebastián festival is the perfect embodiment of the true identity of the Puerto Rican culture. This festival lasts four days, from Thursday to Friday, and is held during the month of January. I would definitely recommend attending it since it basically paints a picture of the complete Puerto Rican experience.