Nonono. It's suggested that Last Night was just another occasion where the Doctor couldn't bring himself to take River there and thus cancelled it. Remember how River mentioned the Doctor constantly cancelling at the last minute?
Furthermore, if you rewatch Last Night, the past Eleventh Doctor asks the Future Eleventh Doctor whether or not he was about to attend River's final night. He responds with "Spoilers" rather than a yes or no.
Just some food for thought but, in my opinion, this was just another story depicting them mid-adventure with the intent of reaching Darillium but, as usual, the Doctor simply cancelled due him knowing the significance of this trip and not feeling ready.