From Anna's vlog description " The babies had no school today so we went to the park & met Matt for some cake! Poor Emilia had to go to school and Edie had homeschooling. I also completely forgot about our 17 year anniversary! Oops!! "
So it's not the wedding anniversary, but the anniversary of them getting together, but still.. she used to make a big deal about things like this. Now she did not even remember the date or do anything for it, but would rather spend the day with her boyfriend. Oops indeed.