- Image via Wikipedia
The pagan new year starts here .. at Hallowe’en. 
So if you feel like a brand new start it could be the ancient memories coming to the surface.
Samhaim (prounounced Sowen) is the Celtic festival at the end of October which became Christianised. November 1st became known as and All Saints Day (All Hallows -Holy) but the day before retained its pagan origins and was known as the evening before All Hallows.
Mexicans have the Day of the Dead at the same time when those who have died are remembered. It has got nothing to do with scaring people out of their wits and is more a celebration of life.
The origins of Hallowe’en are explained here. But to be honest, your prospects and customers may be more familiar with the “trick or treat” approach, so why don’t you give them a trick or treat experience? Use the festival to deliver a message that is relevant to them, and give them a choice of something enjoyable or scary!