Riiksmuseum on King's Day

Depending on where you are staying and what transport you will need to reach the Rijks, it could be a problem. I was in Haarlem and taking the train to Amsterdam during this week in 2018 and I saw notices in Amsterdam of certain tram lines and buses that would not be running on Kings Day. Otherwise, if the Rijksmuseum is open and you can reach it easily, it could be a good day to go.
Hope it works out!

It will be a Sunday, so maybe more visitors than usual just for that reason. Some people will be partying, some will be going to museums and then partying. Hopefully not too many partying and then going to museums.

You'll encounter lots of partying, orange-wearing people on the way to and from wherever you go. Just because you don't drink doesn't mean you can't have a good time or enjoy watching the Dutch celebrate a national holiday.

We were there on King's Day last year, a little apprehensive about all the street noise outside our hotel window. But, as the desk clerk had promised, everything quieted down promptly at 10 PM.

We went to the Rijksmuseum on King's Day several years ago, and it wasn't very crowded - FWIW. The crowds in the Museumplein (sp?) convinced us that we are very much lightweights when it comes to drinking.

I thought in 2020 it was on the 27th, a mon.? We will already be in the city, and yes I can and probably will enjoy the ambience without imbibing, but my husband also has medical issues that would make getting jostled around in a crowd all day unpleasant and unsafe. Thought maybe the museum would be a quiet respite.

Most of the heavy drinking occurs on the evening before King's Day. On the day itself it's more family friendly. More of a flea market/food festival/live music vibe. As the trams inside the city center won't be running, best to spend time walking around the Jordaan/nine-streets area of the city and just soak up the atmosphere.

Assuming you have your hotel in the city centre, just have an easy stroll to the Rijksmuseum, enjoying it all or avoiding it, whatever your mood. Amsterdam is a compact city.

Yes, April 27 is a Monday. I believe it will be a National Holiday - that’s what I was told when I was there in 2018.

Oops, I stand corrected, it's a Monday. I wonder where I got Sunday from.... not a calendar!

So, the end of a three-day weekend for the Dutch. No reason to suppose the museum will be less crowded, might be more crowded for the same reason it would be on Sunday. What you want to avoid, though, is those revelers who decide to hit the museum after a hearty morning of drinking! ;-)

On king's day, there will be a lot of activities. And as long as you don't hate the colour Orange, you will be fine. I think it's one of those days you just love or will drive you mad. Either way, I don't think the museum will be very busy!