The Balinese Hindu's just had their day of silence, where they are not allowed to light fires, turn on lights, enjoy entertainment, or travel.  They do this basically to hide from evil spirits and to start their new year off well.

 The Ogoh-ogoh parade happens the day before that.  A priest tries to put spirits into the floats and they try to scare other evil spirits away.

 Most of the floats are monsters but some have some are not so bad.