Most of the women I know like to learn everything before they jump into an activity. Hosting a cycling clinic where you teach a specific skill may be a big draw. Again, keeping it to only women creates that "safe environment to fail" and may draw more in. It would be fine if some of the less intimidating men taught along side you as you don't want to create the illusion of an all girls club. You could plan short social ride after the clinic where they can use their skills and see how fun it can be. Then give them a copy of the schedule and invite them. Afterwards, make it a point to call each participant and get feedback and invite them to come ride with the group.

Good luck!