One thing our region has done, with mixed results, has been to run a Ladies School. Several of the more experienced female drivers act as instructors. Unless a male is needed to run the course they are banished from the site. We have tried to keep charges to about the same as our regular event. We typically do it on a Saturday that has a regular event on that Sunday.
The classes last the better part of the day and involve a course walk, a ride with an instructor, then numerous student runs.
I said we have had mixes success because we have had as many as a dozen students, and as few as two. Our region normally has 2-3 ladies in an event, if your region is bigger you might have a more consistent turn out.