festival lists says it’s a much smaller one (which isn’t necessarily a bad thing, I like the small town things more anyway…
Having attended many of these events, I’ve noticed that when it's just one or two farmers with only a few cows, the event is quite short—usually over within about five - ten minutes. So, it's not really about the size of the location, like a charming Swiss village, but rather about how many farmers are working together to bring their cows through simultaneously. It also depends on whether there are other things happening, like food, music, and other festivities, which can make the event feel much larger and more involved. I personally would not travel that distance for one that advertises itself as being small.
Since you’ll be in Mürren, it's worth noting that the surrounding areas (Wengen, Lauterbrunnen, Grindelwald) all host Alpabzug events. However, unlike other locations that sometimes announce the date a year in advance, these events typically aren’t advertised very far ahead of time. Be sure to check with the TI when you’re there for anything local.
Interlaken also has Alpabzug events, and one particularly fun sight is when the cows walk over the bridge to Ringgenberg.
Note: the cow parades are called Alpabzug, Alpabfahrt, Désalpe (in the French speaking area, you could try searching this term) and even Züglete. Some places might not even advertise in English, so searching these words might help you find more locations.