Khantoke is a Lanna Thai tradition, not just something invented for tourists' amusement. Thai Lanna was a civilized Kingdom that existed in the area of present-day northern Thailand. King Mengrai was the king who founded the capital and the dynasty. He accomplished and contributed to the prosperity of the kingdom in several aspects, e.g. political science, Buddhist religion, art, and culture.
There are several traditions that eventually became northern heritage one of which is Khantoke. Even today, khantoke implies dinner or lunch offered by a host to guests at various ceremonies or parties, e.g. in the home – weddings, housewarmings, celebrations, novice ordinations, life extensions, or funerals.