I have some dates that may be of interest, that are not on the above calendars. The Steve Dinsdale Memorial will be held at Gum Valley, ( just south of Mackay), on the 7th and 8th of June. Gum Valley has hosted a round of the MX Nationals in the past and is rated as one of the best tracks in the country. Although it is mainly a modern bike meeting, there are classes for pre '80 and pre '90 bikes.
There is another event run by the Whitsunday VMX club at a track called Charlieville ( north of Mackay) on the 6th of July. Although I have never ridden at this venue, all the reports that I have heard rate it very highly, described as being very much like Conondale. This date is a clash with QVMX round 2, but you never know what can happen with weather and postponements.