I don't get Juneteenth but I didn't have to, it doesn't affect me. Although personally I think the name is weird - it's definitely grammatically incorrect. But whatever, y'all have fun. I like Mac'n'cheese though.
It's just the "Nine" in nineteenth (a word that only has long vowels) replaced with June. June 19th turned into a single word. It specifically celebrates the day slavery was abolished in Texas.
Yeah, One of the vendors I work with emailed me to let me know they'd be off that day and I had to look it up. It would have been the same if it was called abolition day or something like that but there's something a little annoying about the fact that they made it halfway with putting the date in the name.