Many shops in St Peter Port will be staying open until 9pm each Thursday evening until 23 December.
Organisers say there will be buskers supplying entertainment, extra parking at Lukis House in the Grange, and Le Petit Train will be offering a free park and ride service from Charles Frossard House to the Picquet House.
"The train was incredibly popular last year and really added to the festive atmosphere, and we hope people will enjoy this service again." - Korinne Le Page, Guernsey Retail Group.
CT Plus' night bus services, N1, N2, N3 and N4 will depart from the bus terminus each Thursday at 9.30pm to take shoppers home.
Ms Le Page says that, in addition to the shops staying open, charities and not-for-profit organisations have been invited to take pitches through town to add to the variety for shoppers.
"We know how hard the last 18 months have been for everyone and it so important to support our local retailers.
With the cancellation of a number of Christmas and school fayres, we hope charities and schools will also be able to take advantage of the crowds who visit town on the four late night shopping nights.'
"These evenings are very important, not just for the retailers to show what they have and what is available locally, but also for the community because it gives that sense of fun and draws everyone into town. The lights are on, it's festive, and we want everybody to feel that they can come in and take part.
"Historically, people have always wanted to come into town at this time to meet their friends, put on their best and go to the market. Of course times have changed, but I still think there is that social aspect, and that is what everyone has missed during the lockdowns that we have had."
Shoppers are reminded to take a Lateral Flow test before they leave home, stay home if feeling unwell and remember that mask-wearing in shops is now mandatory.