Bartering your tickets can give you an opportunity to see other types of events that you might not necessarily have thought about attending.  Trading sporting event tickets for concert tickets can be very advantegous to both parties.  You might even be able to trade tickets for services, or services for tickets.

Once you decide what concert or game you want to attend, you will need to find someone who has tickets to that event, and find out if they are interested in trading for your tickets. CraigsList.com is a great place to look for tickets.