Get tips for encouraging attendance at library functions at the "Playing to an empty house" post at Unshelved Answers. Samples of ideas suggested include:

• Have a monthly event on a recurring day of every month so parents & customers can put it on their calendars
• Display program theme-related books available for check out
• Having people register (and implying there's limited space even if there isn't) helps them make a commitment to attend your program

Read all the suggestions here.