Mrs Brierley said Ms O'Neill talked about different body shapes and what people should wear to suit them, and there was time afterwards for quick one-on-one advice for those who did not know their shape.
"She is really funny. I'd definitely advise people to wear waterproof mascara."
Ms O'Neill is a personal stylist, motivational speaker and author with more than 20 years' fashion experience.
Mrs Brierley said they would love to have about 150 people head along to the event, but ticket sales had been slow so far.
Tickets are available from the Plunket Office in Pukuatua St (cash only), BNZ Amohau St or online at www.iticket.co.nz. Tickets are $25 and include a light supper. A cash bar is available.
It is being held at the Arawa Lounge at Rotorua Racecourse. Doors open at 7pm.