Marketing To Schools

We offer onsite conferences in various cities across the United States training educators on various topics. Our basic mode of advertising has been email campaigns to alert who we believe to be the ones who would make the decision to send their educators to our conferences. We also have a presence on social media. As with any form of advertising, we have found email campaigns and a social presence to be a hit or miss with increasing conference registrations. Does anyone who has experience advertising to k-12 schools know of more effective ways for us to alert educators of scheduled local conferences? Thanks.