The Working day before Independence Day (July 3rd) is just not an official holiday. On the other hand, the stock market provides a tradition of closing at 1:00 PM on that working day if it falls during the 7 days. Sure, You should buy and trade stocks after hours. https://financefeeds.com/cftc-recovers-18-million-tied-to-sam-ikkurtys-copyright-ponzi-scheme/