Craigslist is a great place to market your season tickets.  You also can find people who want to pick up last minute deals the day of the game.  Creating an eye catching ad is one of the more important things.  Knowing what time of the week the best time to sell certain types of tickets.  CraigsList.com can be both a great place for a season ticket holder to sell some last minute tickets, and it also can be a great place for someone who wants to buy directly from the season ticket holder.

The day of the game/concert is a great time to find tickets from people who had a "last minute" change of plans.  If you are calling about a Craiglist ad, be ready to make a decision about whether you want the tickets.  If you wait too long to decide, the tickets you called on might be sold by the time you call back.  This is especially true for "high demand" games such as when the New York Yankees, Boston Red Sox, or the Los Angeles Angels are visiting your teams stadium.

Due to many people looking while they are are work, the time during lunch time can a very lucrative audience for your tickets.

You also can keep a watch out for people who post "Want to Buy" ads on CraigsList for the event that you have tickets for.