Question!

If you have a certain expertise, let's say you're a certified relationship counselor and back home you have your own business on this subject and you want to give workshops all over the world on the subject (but to begin with, here in Thailand. So you fly in for 1 month, teach a couple of workshops, and fly out again)

Is that possible in Thailand? Or do you still need to open a Thai business?

I see many people flying in to koh phangan and give a teacher training course of yoga for exemple somewhere at a yoga school and then go to another country and do the same there. Do they use temporary work visas, if that exists? Does the yoga school give them a workvisa? They can't be doing it illegally cause it's right in the open on their website and Facebook....