Barney decided to go celebrate a Friday nite pretty much how he celebrated most Friday nites. A few drinks at the bar, some carousing, or at least fun conversation and then who knew? Who knew, indeed. The man who constantly suited up certainly didn't know that he'd find a certain redhead at the bar.
What with her..condition..Barney would have assumed that she'd spend all of her time in seclusion. Better to keep away temptation. Temptation like Barney. Grinning to himself, Barney went up to the bar and spoke closely in Red's ear. "Your wait is over, Red." Because, duh, he was there!