As a German I'm very familiar to similar rockets like this from our New Year's celebrations but never seen rockets being shot out of the hand. Not to mention the sheer amount of rockets being fired into the air at the same time.
During the festivities in honor of El Carmen and Magdalena in Canga del Narcea - Asturias, there were several hand rocket shooting events, this is actually called Puesta de Bandera de las Peñas and started at noon on July 15th. Everyone shooting is rquired to have a license and had to take a course beforehand.
Stay tuned for many more fireworks from Cangas del Narcea.
This video was recorded with this camera on this gimbal.