The Spice Girls have reportedly been invited to perform for the Queen of England at the Royal Variety Performance in London on December 3rd, which is the day after the girls first stop on the Reunion Tour in Vancouver.
An organizer of the variety show said, "We've been having talks with them. They are keen, but it's a question of making it work physically."
I personally think this would be an impossible feat for the girls, especially considering that they have a performance on the 4th of December back in San Jose. It seems like a lot of back and forth, but more power to them if they try to pull it off.