I need a Caricaturist

I'm looking for a Caricaturist, someone fun to help entertain at my firm's summer party on 1 July in London, UK (WC1H 9JP) for 2 or 3 hours from 7pm. I need someone to wander round the party entertaining the guests with on-the-spot creative sketching. This is an in-person gig in London, UK.