There different types of traditions like a basic one : Noche de San Juan.
And off course each town has there one tradition or town festival, like these ones:
LOS COSSIERS DE MONTUÏRI: Summer after summer, the Cossiers, documented since 1821, perform a collective, rhythmic and enthusiastic dance, full of colour and sensuality, which fills the streets of the commune.
FESTES DE LA BEATA DE VALLDEMOSSA: One of the most popular and deeply-rooted festivals in Mallorca, you won't want to miss it.
Here you have videos of the two traditions: