The Greeks had many festivals in which the God`s statue was often brought out and carried among the worshippers.
The purpose was to please the God`s so they would act favourably on particular projects such as the next harvest.
Messengers were sent out to announce the festival dates.
Even wars often came to a stop during festivals.
Greek Mythology
The Penguin Historical Atlas of Greece (Hist Atlas)
Paralumun New Age Village