Seating Charts add-on will allow you to create nicely styled seating charts/maps of your event. This way, attendees will be able to pick a seat and purchase the ticket for that exact seat which tremendously helps with the event organization and generally lets you represent your event area in nice, graphical way which is always a welcomed feature.
This add-on is installed like any other WordPress plugin and thorough instruction on that (in case you need it) can be found here.