The first game of the 2016 tour was Jo and Ernie's 20th Wedding Anniversary. Donna's T-shirt design commemorated that. In these two photos we see Chloe modelling the shirt in the Bugle pavilion and one of the T-shirts draped artistically over the back of a plastic chair. The cartoon has Jo saying "Ernie - when you said you'd brought brought protection, I didn't think you meant this!!!"
And here, on the verge of a loving embrace (or is Jo checking Ernie's teeth for vestiges of green icing?) are the happy couple.