Yup… Bitcoin trades 24/7 all around the world. Exchanges and private transactions. All available on the blockchain ledger anytime, anywhere.
It is not limited to certain exchanges that are closed on ‘Bankers Holidays’.
NVIDIA specializes in high-end computer graphics cards, which are the preferred ‘engine’ for running a bitcoin node and ‘mining’ calculations for new bitcoins. They cashed in on the upswing of Bitcoin popularity. I expect that demand will level out and maybe decrease a bit with time. Trees do not grow to the sky.