What if we have the yard sale this weekend, May 18? 48.6 = 57

48.6 - 57 reads like a positive omen for hosting a neighborhood yard sale (48.6 the Well is uncovered and all may drink) but the catch is I was consulting the I Ching because the weather forecast is 80% chance of rain. In fact, I wasn't even neutral when I asked the question. I had made up my mind to cancel and was just looking for confirmation but now I'm not so sure... 57 is a gentle wind which might indicate there will be a breeze but not an actual downpour. Any suggestions? I have 5 friends planning on bringing their stuff over to sell so I hate to disappoint people but on the other hand setting it all up and then having it rain would be a bigger disappointment.
Thanks for your input!
Rosada