The RBA's board of governors meets 8 times a year, in February, March, May, June, August, September, November and December. It is here that the board makes a decision on the official cash rate target.
The board used to meet 11 times a year, on every first Tuesday of the month apart from January. It lessened the number of times it meets to provide more time for change between meetings.
However, the RBA can alter the cash rate at any time outside of the meetings. This is rare, but can happen. In March 2020, in response to the onset of the COVID pandemic, the bank cut the cash rate twice. Once at the scheduled meeting and then again mid-month at a special emergency meeting.