In reply to Jamie Wakeham:
Reckon you'll be fine. The Font is in an industrial building area and not that convenient a walk to either Earlsfield Station or AFC Wimbledon (which would be the other competion for parking.) The residential streets around are by and large only permit monday - friday. There ought to be plentiful recharge bays around the area by now too, though don't know how hotly contested they are at the weekend.
Worse case scenario head toward Tooting Broadway and jump a 44 bus toward Wandsworth and get off at Swaffield Road stop. Coming through town that time of day, the south circular can be a bit shite, mind. Consider M25 round to A3 and up as an option. (Watch out for Surrey police speed vans on the A3 on a Saturday! They often hunt in pairs.)