Ryan Kwanten, who plays Jason Stackhouse on HBO's "True Blood," will be at Boston Store in Brookfield Square mall on Saturday to promote the Mambo clothing line and meet fans.

Kwanten will be at the store from noon to 1:30 p.m. Saturday and will sign autographs and take photos with fans, who can submit questions for him to answer during the event.

The store also will have Summerfest promotions going on during Saturday's event. The first 100 customers who check into the Brookfield Square event via foursquare will get a free 4th of July Summerfest ticket.

Shoppers can enter a contest to win four deck party tickets, plus food and drink, for the Briggs & Stratton Big Backyard Stage on July 4th.

Customers who purchase any two MAMBO items during the event will receive a pair of Summerfest tickets. (Limit 2 tickets per customer)