Err 2 Hungry Ghost Festivals?

i checked the lunar calendar.
okay i actually know how to read a lunar calendar.
so i'm not really entirely useless afterall.
i found out that the hell gate's gonna open twice next year.
apparently one of them's fake.
i dunno.
that's what ma said.
but if one of them is fake,
then how do we know when they're coming out.
that's why we have to do the same preparation and invite and welcome them up here twice.
uhh.
weird.