I wish there was more time available to write this up but just treat it as a Sunday. “Vasár- és ünnepnapokon” is the usual way to say when something is open, translates to “sundays and holidays”, it’s rarely separated. The law dictating employee-employer relations treats them almost the same, the exceptions won’t affect you. (2012. évi I. törvény 101. § (1), 102. § (1))
Edit: November 1 and 2 is also when many will visit cemeteries to remember their dead. While theoretically also just a holiday, please be mindful of this day is sorrowful for many and proceed accordingly.
Credit:stackoverflow.com‘