Adding to that are other events. One important one is music: celebrate with live performances of (local) bands.
Another one could be a race. Semi-marathons along some of the farms in the region, to raise awareness of the producer sites.
An element that features on the Stanthorpe Apple & Grape Harvest festival is the election of Young Ambassadors. This could be linked to them (young girls and boys) to have a role in promoting local food throughout the year.
There are of course many more elements that can be added. Feel free to do so in the comments :)
To connect with urban connected people, there should also be a possibility to organise your own event and connect it to the main organisation. The way Twestifal operates could serve as an example. People organising their own event can submit it on the festival main website, and have it featured on an interactive map of events.
More info on the Stanthorpe Apple & Grape Harvest Festival here:
Picture grabbed from the Queensland Museum website (without permission): http://www.qm.qld.gov.au/