What to see in Guatemala City on Dia de los Muertos?

The research you did online should be sufficient I can't give you any more info in that area than they have already given. But being a Guatemalan resident I must say that I would recomend Antigua and Lake Atitlan in particular Panajachel, San Pedro, and Santiago. They always have big festivals that are unique to the indigenous around the lake. Plus the lake is beautiful you are guarenteed to have a good time. Hope this helps!!!