You can also take a look at myswitzerland.com > events > Customs and traditions.
For example
31st Federal Yodeling Festival
https://www.myswitzerland.com/en-ch/experiences/events/31-eidgenoessisches-jodlerfest-zug-2023/
Swiss Folk music festival in Gstaad
https://www.myswitzerland.com/en-ch/experiences/events/swiss-folk-music-festival-in-gstaad/
Many towns and villages have a local yodel club, here is one that I found in Bern, but there are lots of them all over. If you wanted to reach out to a few maybe you can get more information that way as well
https://www.bernabern.ch
I don't know about lessons on how to play one, but in Habkern (above Interlaken) you can see how alphorns are made
https://bernatone.ch/en/home/