Hi Andy
It's not a problem spraying a boat during the sticky weekend depending on what preparation you can get done first.
Option 1, Back to new looking. You will need to sand right back, fill any dings, prime (Green Ti primer is best, can be brushed or rollered on). You can then de-nib ready on the Saturday ready for topcoat early evening.
Option 2, Freshen up. If you can get me in time to start work early on Saturday you can key up the current top coat, fill and prime any patches, then we can topcoat early evening. It's likely that it will gain a bit of weight with this option.
Either of the nearby Travelodge's are reasonably priced.