So it's some ceremony where the aborigines open up events by announcing that their allowing the event to happen?

Edit: that's exactly what it is:

A Welcome to Country is a ceremony performed by a local Aboriginal person of significance, usually an Elder, to acknowledge and give consent to events taking place on their traditional lands. It is a sign of respect and protocol that dates back to traditional times prior to colonisation.

A Welcome to Country is different from an Acknowledgement of Country, which can be performed by both Indigenous and non-Indigenous peoples to recognise the continuing connection of Aboriginal people to Country. However, a Welcome to Country can only be performed by Traditional Custodians of the land.

Fuck that noise. All the land in Australia belongs to the descendants of the English penal colony established there who took it by right of conquest. What an enormous slap in the face to have to ask for permission from the natives to honor their own war dead.