I can smell the rose water and dog rug talc from here. Any publicity is good publicity so i am not going to be cruel on this one. Besides the WI is a secret right wing paramilitary organisation so show plenty of photographs of AK47s and torture apparatus and you will be fine.So, just think of the 'traditional' WRI - Scone and cake competitions; Knitted hat competitions; Best winter photo competitions!
On a serious note; Powerpoint is good but many presenters end up using it instead of giving a presentation...if you get my meaning. Be yourself and talk about that you are really comfortable with. Keep mega basic level unless asked to embellish and stick to principles rather than detailed methods. Cut off tangents mercilessly and use humour without a smile for hecklers and dominators.
The down side is that you will be chatted up every time you visit the post office by women who wear sensible shoes and smell of retirement home disinfectant but these women do have power so it could open up other opportunities. Remember keep it professional.....and no sex....they are b**gers on the casting couch