The events start at 4pm with carol singing at the Abbey Church, and the switch-on taking place at 4.30pm at the church.
Children will get their first glimpse of Santa who will arrive with a sack full of presents, while hot chocolate and muffins will be available.
High Street will be open to pedestrians only and the majority of independent shops will be staying open to 7pm, some offering special discounts on the day.
A variety of events are planned along the street, from face-painting to coffee-roasting demonstrations.
The town’s street samba band will also be playing.
To help the fundraising of the Christmas lights, prize quizzes are available from around the town.