Because there is no good time of day or night to do updates I thought July 4th would be a good time/date. I figure most of the US visitors will be watching things blow up and that at least will minimize the number of visitors that can't reach the site while I do much needed updates.
The server may also be moving in the next week or so to a better box. This could have the potential of extended down time. Not to fear however as the site will be back as quickly as possible. I always count on Murphy's law to hit however.