The Growing SA conference is the latest major agricultural event to fall victim to SA's most recent COVID-19 outbreak.
RNA Beef Councillor Gary Noller said that the number of intrastate entries is enough for the competition to remain competitive.
Melbourne is expected to enter a snap lockdown from midnight in an effort to contain the growing outbreak of the COVID-19 Delta variant in the state.
Organisers of Australia's largest agricultural field day have made the "highly disappointing, very frustrating but absolutely necessary" decision to postpone AgQuip's August event.
NSW Chief Health Officer Dr Kerry Chant will decide if the AgQuip field days can proceed next month.
Three new mass COVID-19 vaccination clinics are set to open this month, at Victor Harbor, Mount Barker and Gawler, which by August will add capacity for 4500 more appointments each week.