A holiday tradition is under way at the Orlando Museum of Art.In its 26th year, the Festival of Trees is a collection of more than 40 donated trees decorated by designers, all for sale to benefit the OMA.The theme of this year's event is "Once Upon a Time: A Fairy Tale Festival."In addition to the trees, the festival offers entertainment, chef-created gingerbread houses, dining and shopping."It's a really exciting year," OMA Director of Marketing Linda Cegelis told Fox 35's David Martin.The festival runs through November 18. Admission tickets are $10 for adults, $6 for children. Go to OMArt.org for more information.