Take most effective ad from a/b testing and run with it hard. at least 60% of the ad budget will be spent during this period

Keep getting people hyped, if people are hyped they will share with friends, who will then get hyped and create exponential growth. CodeDay Market takeover!!!!

Bring up at club meetings, remind people CodeDay is coming up soon

Just everything possible to promote event. Unless volunteers have a specifically designated task they will be focusing on event promotion.