Hi Catherine and welcome to the Disney Parks Moms Panel.
How cool that you used to work in the UK Pavilion at Epcot!
I have just checked availability on the Walt Disney World website for a party of 10 Guests to eat dinner at the
California Grill on 5 April 2016 and am afraid that there are no tables available that day from 6:00 PM to 9:00 PM.
As the California Grill is an extremely popular restaurant and Advance Dining Reservations can be made up to 180 days in advance, it is highly unlikely that a reservation for a party of 10 Guests will become available at this late stage.
That said, cancellations do occur and it is always worth checking to see if any last minute availability arises.
Dining reservations can be made
online via the Walt Disney World website or by calling 0800 16 90 748 from here in the UK.
Wishing you a magical holiday filled with memories which will last a lifetime!
Emma