Yes, the weather forecast is looking "ish" (as an old friend of mine used to say.) But, hey, as long as I'm able to get my tent set up while the skies are still dry (which it looks like I will be), I'm happy. My tent has been through absolutely torrential thunderstorms; nary a drop gets inside. I

my tent.
As for the riding, oh, well -- I've ridden through a few day-long downpours (and I recall a Seagull Century that was not only rainy, but windy and cold as well!) The low temps are expected to be 55-60, so that's not bad at all, and the weather is supposed to get nicer as Sunday progresses. I haven't done a night-time rainy ride (except for the occasional getting caught on the commute home, but that's only 45 minutes, tops.) I'll be fine. The rain will just give me one more thing to ***** about -- errrrrr, focus on -- so I don't get bored.
Charlie, the ride officially ends at 4:00 on Sunday afternoon -- they do a "last victory lap" or something at 3:45. My plan is to ride through as much of the night as I can, maybe catch a 90 minute nap or so in the wee hours (maybe I'll wait 'til when it's raining the hardest, LOL!) and be back out again by sunrise or so. So if all goes well, I should be upright and rolling whatever time you all arrive on Sunday.