For this feature, you need the Pro version of CampaignDot.
1 - Buy and install Campaigndot Pro
2 - Create a post
3 - attach a marketing banner
4 - Set the start and end date where Banners will be displayed
5 - Set Dynamic banners in CampaignDot and control how your marketing schedule
6 - This is particulary handy to program how banners will show in advance.
5 - Did you know that with CampaignDot Pro you can get Statistics of each banner campaign ?