Its also a-not that big-thing in Poland-so one could expect them is most major cities there. Check there city/touristy websites or try TripAdvisor. Do NOT expect the equiv. of those Xmas-markets.
Here in NL it was (and yes, thats history now) a special thing in cattle-farming areas-the easter cows market-where the local village butcher came to select the best animal for the Easter sale, with a large market with other things for the locals to purchase. I can imagine the same thing for England/UK? Such gatherings of cattle are prohibited now for fear of disease spreading around.