Hi @Kathleane0 I would look at all the similar listings in your area and base your event-date pricing on that - e.g. if your listing is nicer and/or has better amenities than others (which looks likely!) then charge a bit more than they do for event dates, etc.
If the general booking pattern is that guests tend to stay only on event dates, then yes, it sounds like a good idea to offer a lower rate either side to try to encourage a longer stay.
Also, a few comments re your listing.
- Mention female-only in the first or second paragraph. Ditto Wifi and free parking on premises (some guests don't read the amenity list).
- Add a photo of the outdoor seating/table. (I don't get a sense of the outdoor area).
- Lose at least half the clothes hangers. Nobody needs that many!
- Take a new photo of the bed without the boxes underneath, plus a couple more photos giving a sense of the whole bedroom.