There’s nothing like that here in Ireland, so fiance and I started our own tradition.
Every Christmas fiance’s mom makes us a whopper Christmas pudding, so I’ve started saving a chunk of it for our ‘Christmas in June’. We celebrate by having a slab of pudding with a dollop of brandy butter which will knock you into next week. Fiance adores Christmas pudding, and nearly burst with excitement when I reminded him ‘Christmas in June’ was today. It’s something silly, but I love our tradition.
p.s. Due to the vast amounts of alcohol in it, Christmas pudding lasts forever. If anything, it gets better with age.