 Another important annual event is Las Ramas on December 16, which begin Las Posadas, a type of caroling event carrying branches.The main museum is the Regional Museum of San Andrés Tuxtla, which contains objects from the region, many of which were donated by residents.It was opened in 2008, and features artifacts from its pre-Hispanic history as far back as the Olmecs, and the development of the tobacco industry, especially in the 19th century.