Hi Lynne!
Unfortunately, while evening tickets are available for Guests attending conferences at Walt Disney World Resort, there are no half-day theme park tickets available for Guests to purchase who are not attending a conference. So unfortunately, you will not be able to purchase a ticket to enjoy only the evening in the theme parks. However, you do have several ticket options to allow you to visit them on the evening of your arrival.
Over the next several months, Magic Kingdom will host
Mickey's Not-So-Scary Halloween Party and
Mickey's Very Merry Christmas Party, which are specially ticketed events with exclusive entertainment and tasty treats. The parties begin at 7:00 p.m., at which time the park closes to standard theme park ticket holders. So if you are visiting this fall and your arrival date is a party day, you could purchase a party ticket for your evening entry to Magic Kingdom.
Otherwise, you could upgrade you
theme park tickets to include an additional day for your evening arrival. Adding additional days on your theme park tickets is much less expensive than purchasing single day tickets and you can upgrade your tickets if they are already purchased by visiting any theme park ticket window or Guest Relations location or any Disney Resort hotel Concierge desk within 14 days of the first use of your ticket, where you will be charged the difference between your current ticket and your new ticket with an additional day.
Please let us know if you have additional questions as you continue planning. T-T-F-N, ta ta for now!
~Crystal