It will be up to you to find somewhere to stay, but there are plenty of options, many close to town.
A full list is at http://www.bellingermagic.com/pages/bellingen-accommodation/ and you can also check out http://www.bellingen.com/index.html
If you want to go straight to the booking search for what is available on particular dates, try http://www.bellingermagic.com/accomgrid_condensed.asp
Some pretty cheap options are the YHA backpackers right in town, and the green star awarded lodge, 1km out of town.
You can camp at the local showgrounds: very basic but close. We will chase up the details asap.