New for 2015 is an entertainment stage. Kids and adults can enjoy watching jugglers, musicians and a DJ playing Halloween tunes. There will also be a themed hay maze and scarecrow field. Also new for this year will be "education stations" and a pumpkin decorating contest.
Sounds like fun! Recommended ages by the zoo is 4 - 12.
Tickets are available online through Ticketmaster. Members of FONZ can get discounted tickets (limit of 6 tickets at $20), and non-members ($30) - it looks like there is also a processing fee. For more information, please see the National Zoo's website.