It is the Feast of Mallorca, which commemorates the oath by Jaume II of the Letter of frankness’s and privileges of the Kingdom of Mallorca. During more than a month, mainly different activities are organized: cultural routes, open days in museums of Mallorca, conferences, a latina sailing race, a sling shot competition, racing trot competitions in the hippodrome Son Pardo, etc.
It celebrates an institutional act (September 12) in which they give awards and prizes to mallorcan personalities that have stood out for their work in the world of art, culture, letters, or for their contribution to civil society.
You can check the whole program here.