Yes, it’s his yahrtzeit.
DaasYochid:- Let me complete your staterment:- Today is the Rema’s 441st Johrzeit.
I was at his Kever earlier today, and now am sending this e-mail from the internet cafe at my hotel in Krakow.
It is too bad that he only lived to be 52; Notwithstanding, he was very close with the Mechaber who lived into his 80’s,a nd they corresponded together extensively.
I was at the Mechaber’s Kever this past summer in Safed he died Nisson 13, 1575], and guess what:- When returning on Route 85:- The traffic jams were also imposssible & impassable, and this wasn’t even Lag b’Omer, but just a routine day in the middle of the year, so something is going to have to be done about Route 85 soonest?
If not, on Lag b’Omer 2021 & 2025 when on Friday, there is going to be a mass Chilul Shabbos on Route 85.