Perhaps this page should read 'International Mezcal Day', as although this 'National Day' is an all-American creation, there are a great many of us around...
Those mezcal cocktails all look great! Given that I love that spirit, I'm going to have something later. But I think I'll have a Mezcal Martinez. I didn't see one on your site, so if I do, I'll post the recipe that I'll nab, and maybe modify, from somewhere!