Hi Cheryl,
Welcome to the Disney Parks Moms Panel! I'm afraid your question didn't reach us in time to help with your current reservation but I hope the answer may help you with a future reservation.
Depending on the time of year and how busy a restaurant is, you may not be allowed to add someone to your dining party at the last minute. However, I have had some success with adding someone when our plans changed unexpectedly. If I were you, I would visit the
Sci-Fi Dine-In Theater Restaurant as soon as they opened even if the reservation was later in the day. I would politely ask if another guest could be accommodated with our party. While the restaurant might have to decline, I believe giving them as much time as possible before your reservation and being polite when you ask gives you a much better shot at making the change.
Cheryl, I hope you found success during your visit to
Disney's Hollywood Studios. I love watching the movie clips while dining on a delicious burger at the Sci-Fi Dine-In Theater Restaurant. And thank you for visiting us with your question. I hope you'll let us know if we can help you with any other planning questions!
Wishing you a magical day,
Amy H.