Hi, Im from Mongolia, and i participated in kind of meditating group here, and i heard that they have a center in Formosa, Taiwan. I dont know specifically where and i'd like to go there and have some retreat there. With people said i cant get really hold of this group right now, i mean i can but it might take me some time to get responds or something So, im wondering, if i just say im traveling and going to this center for meditation about maybe not longer than 3 weeks. do i really need invitation letter for the visa? Does anyone has experience with this kind of situation?
Thank you

Anar