Volunteer co-ordinator Michelle Blackhurst said some important volunteer positions remained unfilled.
Race day volunteers in particular are required from August 30 to Saturday September 5.
"You can nominate the number of days you wish to help out for, from one day to five," Ms Blackhurst said. "No experience is necessary and we will provide you with all the training you need."
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READ NOWThe Northam Aero Club will host the event, expected to attract hundreds of spectators and pilots from around the world. Visit www.northamnationals.com call Michelle on 9622 6129 (weekdays) or email cdo@northam.wa.gov.au.