Why events must always host welcome to country

I attend a lot of events all over Australia as a professional speaker and I have noticed a trend. When events are hosted by government, they are always opened with a Welcome to Country from a local indigenous person. At the very least there’s an Acknowledgement of Country from one of us blow-ins. However, outside schools, government departments and council events, this basic sign of respect for the traditional custodians of the land is a bit hit and miss in the event industry.