What is the Holiday Booster Promotion. Take part in this huge summer promotion at Betsson as every month until September you get to collect tickets to one of three monthly prize draws. . The Summer Holidays promotion is currently underway and has two more weeks to go. Make this season one to remember by winning some of Betsson's Summer Holiday prizes. July 3, - Reading time 4 min. Come and boost your Casino fun with great monthly and weekly rewards. Summer Holiday Boosters: Play casino to win prizes such as cash, the. The annual Summer Party for our colleagues in Estonia was a blast! Held at the picturesque Laukataguse Holiday Village near Tallinn. In Week 3 from May 18th to 24th, players stand the chance to win a holiday to. On behalf of all of us at Betsson Group we wish you all the best for the holiday season and a wonderful new year We thank you for.