We were welcome to participate in the activities. A chanting priest doled out perfumed rice to throw at the statue, passed some holy fire around, gave us some sweet yoghurt to drink and collected donations. In the end, we got a whole meal - rice with vegetables, some sweet dessert and a banana.
Shiva and (much smaller) Parvati - Ganesh's parents. Shiva is holding a sword - probably a reminder of how he cut off his son's head so that it had to be replaced with the head of an elephant. (In his defence, he didn't know it was his son at the time. A misunderstanding.)