Is there any other holiday/celebration?

We all know of Naming Day, but is there others celebrations/holiday in the Matoran Universe and in the Agori society?

I’m not too sure. There seems to be no religion that either holds (except Mata-Nuism which is more historical) which is what most holidays are based on. It does seem like the toa mata becoming toa nuva was treated like a holiday though. Teridax being defeated and spherus magna being reunited might be a new holiday for both matoran and agori now.