If you have to take the feeders down for a week, will the hummingbirds return once you put them back up?
Couldn't you find someone ~ perhaps a neighbor or a HS student, to tend to your feeder? I think if temp is not too hot, one replenishing should do it!
If others around have feeders & garden blossoms they should be fine, IMHO.
We are on similar zone ~ they'll be traveling back home in a few more weeks, you may have a few stopping by for a fill-ups! From what I read, they have a great memory for where great stops are, I'm sure they'll find their way again!