Hi Lisa! Thank you for bringing your question to the Disney Parks Moms Panel.
A dessert party sounds like a lovely way to celebrate your birthday! While
park hours and dining reservations are usually available up to 180 days in advance, schedules for events such as the
Fantasmic! Dessert & VIP Viewing Experience aren't always available that far out. Each event has its own timetable as to how far in advance the schedule is available, anywhere from about 6 weeks to 6 months in advance. Since we haven't heard any announcements about this event being discontinued, I would just keep checking the calendar to see if the schedule opens up for your January visit.
If you would like to try a different
dessert event for your birthday celebration, I see that both the
Fireworks Dessert Party at Tomorrowland Terrace and
Rivers of Light – We Are One Dessert Party are currently showing availability for January 2020.
I hope that helps! Please visit the Moms Panel again with any other questions you might have. I am wishing you a wonderful visit and a very Happy Birthday!
Anne Marie