Yes, absolutely. It is advised you obtain adequate travel insurance with COVID cover immediately upon booking your place on the retreat.
There are many providers out there. Be sure to check the fine print, the details of your policy, and what your policy DOES NOT cover. Some recommended Australian companies are: Travel Insurance Direct, Aussie Travel Cover, QBE, and 1 Cover. Be sure to be covered for repatriation should you need to return home due to emergency. Some insurance providers do not cover for airline insolvency nor epidemics or pandemics. You may be required by law to travel with a policy that contains COVID coverage. You are responsible for your own travel insurance and the policy you decide to purchase.