There's only a fortnight to go, so now it's time to send reminder emails to anyone and everyone relevant to your event.
This could include your regular mailing list, speakers, any influencers you've contacted, anyone who's bought a ticket already, and so on.
One good tactic to employ if you're struggling to get enough bookings is to invite people to bring a friend. If your budget allows it, a discount on buying more than one ticket (or maybe a family bundle if it's suitable) is a great way to sell more tickets.