If You can, walk trot and canter then in theory you'd be able to do it, however I'd say it really depends on your horse. Even the most easy going horses can get excitable during the rideouts and if you go through areas where everyone's galloping you might struggle holding your horse back.
My mare is a completely different horse in the ride outs and turns in to a jogging on the spot nutcase. (We're hoping to take part too this year)
If I were you I'd get as much riding clocked up before they start, stick a red ribbon on your horses tail and stick to the back maybe have a leadrope handy as Well.