Where did it go?

Are you sure it was not in December for the Christmas Market?

We have only visited one other time and that was exactly two years ago...the pictures keep popping up on my FB timeline, too. Plus, the only Christmas markets we have visited were in Nov/Dec 2017...France, Germany, and Austria.
I suspect, however, that the same cabin-like buildings we visited two years ago here in Budapest in April/May, were probably used for Christmas markets in Budapest.

Perhaps the Christmas market, thus the buildings, have been relocated.

Based on location, maybe it was this, from p. 261 of RS Budapest, next operating on May 5:

Check to see if you’re in town for the Wamp Design Fair. One or two Sundays each month, dozens of local artists and designers gather to show off their products (free entry, 11:00-19:00, schedule at www.wamp.hu). In summer, this takes place in the city-center Elisabeth Square, while off-season it moves to an indoor venue at Millenáris Park (on the Buda side, near M2: Széll Kálmán tér).

I also see a Spring and Easter Fair which would usually be at Verosmarty Ter, but was moved this year, now finished.

Don't know about crafts but there is a place on my to do list after watching a YouTube video. It's called Karavan located at 18 Kazinczy it's a Budapest 1075. It's. All food trucks.

If you go please post a review.

Possibly you were there on May Day or Easter. Here is a list that might help.

http://visitbudapest.travel/budapest-events/

and

https://welovebudapest.com/en/events/

Two excellent sites for things to see and do in town.

That sounds like the Easter market at Vorosmarty ter, I was lucky to catch the tail end of it myself 2 years ago and also be there for the wonderful May Day festivities—wish I could be there today, but the 9th will have to do, counting the days!

Thank you, everyone, for your helpful, timely, responses.
I found this information, which confirmed, indeed, that the market had moved while Verosmarty Square was being refurbished.

However, it looks as if we are about 3 days too late...still going to check it out...just in case.

https://www.budapestbylocals.com/event/budapest-spring-fair/#location

Vörösmarty tér

Not to be confused with Vörösmarty utca; also a stop on the M1 Metro Line.

Both named after Mihály Vörösmarty (1800 to 1855) famous Hungrain Poet and Dramatist.