Take a look at video 3 of our 4 part series to find out more about alternatives to geofencing.
There are other alternatives to geofencing if you want to target a competitor event. You can use custom intent targeting on the Display Network, which allows you to target people who are likely to have visited a competitor website. That means that you are not limiting yourself to the two or three days that an event is on, but are looking at traffic over a much longer period of time. It has much better results in terms of conversions and clicks as opposed to impressions and brand awareness whilst the event is on.
For more information feel free to get in touch with the team here.