World Car-Free Rainstorm Day

it's 5.40 and i'm checking on weather. it's the vaunted "Car-Free Day" and i'm supposed to meet 'mick' at the park in 50min. instead i look at this radar image and see that i'm nestled right to the east of this huge, nasty clump o' wet. makes it hard to get enthused...i'm doubting myself as i write. the prob is that i don't mind being wet, but i don't have the facilities as work to dry my clothes out. hence an even more miserable ride this afternoon. and the clump looks like it will Pour on me/us right about the time the commute really gets going.

what to do?