Mary is joining the crowds and heading to her first ever music festival, but it is not the bands she has come for. She wants to explore the wonderful world of festival food pop-ups, seeing firsthand how these exciting outdoor cooks draw mega crowds as they whip up delicious delicacies in a flash. During her festival adventure, Mary enlists the help of one of the festivals headliners, Rick Astley, together making her speedy cheesy muffins all from her very own food truck. She also creates some surefire kitchen successes with her scrumptious rosemary lamb steaks, vegetable kebabs and a delicious rum and raisin ice cream.