This is the annual Jingle Bells Run with food and entertainment in the Hall afterwards.  More details here. Register at the link or get no food!

From the Send roundabout south of Ripley (Waitrose/Shell) on the B2215 Portsmouth Road, take the A247 south (s.p. W. Clandon, Dorking) for 1.5 miles and the Hall will be on your right.
Or from the A25/A246 junction (Epsom Road, 3 miles east of Guildford) turn north on the A247 for 0.8 mile to the Hall.