Night bloomer

When I came back from having lunch with a friend yesterday I looked at this cactus out front. It's never bloomed before as far as I know. I noticed there were drooping buds like on the branch to the top right and healthy looking buds like the one darkly seen on the opposite side of the same branch. I said to myself, "Yikes, it's a night bloomer!" I meant to go out last night but forgot all about it till early this morning. ( One photo )