So.....
Mandalay on the 13th? Or do you prefer the 20th? How about noon? 1 p.m.? If the weather is good, I'd likely do the shop ride in the a.m., so I won't be the freshest (but I'll be HUNGRY!), but I could bring a change of clothes and at least be in clean(ish) clothes.
If it's 1 or later, I'd likely go home and clean up for real.