I appreciated this advice to allies and other non Indigenous people ahead of Monday, shared by the Indigenous-Aboriginal Party of Australia mailing list (original author Marnie Davis of Women Up North Housing):

“Acknowledge the weight of this time – Invasion Day can be deeply triggering and painful.
Listen more than you speak – avoid debates, justifications or minimising experiences.
Offer flexibility to allow space
Check in respectfully
Do not expect education – this is not a time to ask Aboriginal people to explain or teach.
Challenge harmful conversations when they arise and take responsibility for calling them out.
Share this email and supports like 13YARN and encourage rest and connection.”

(Edited to give correct full name of IAPA)