Lunar New Year, also known as Tet, is one of Vietnam's most important holidays. Celebrated at the end of January or early February (depending on the lunar calendar), Tet signals the start of spring and is a time for family reunion, giving thanks, and remembering ancestors. If you're thinking of traveling to Vietnam during this festive period, here's what you need to know. photo: Huynh Phong Is it worth visiting Vietnam during Lunar New Year?…