My next door neighbor has hung her oriole feeder as well and, between our two yards, it is common to see a dozen or more of the brightly colored birds at once. I find this quite amazing since I've never had more than one or two orioles at a time on migration in the past. Whatever confluence of events has worked to bring these visitors my way this spring, I am enjoying them tremendously and when I think of this season it will be as the "Time of the Orioles."
I noticed the orioles visiting my hummingbird feeders as well, so I removed the bee guards from one of them to make access to the nectar a little easier for the birds. Of course, these feeders are not built to accommodate birds as large as orioles, but this female has perfected her technique for feeding from them.
I don't know how long this invasion will last, but I'm prepared to provide fresh oranges and nectar for as long as it does.