Santana filled in for Rachel. Santana also rapped with Mercedes. They sound so much better singing than rapping. Mercedes wanted the hoped-for hit single from her album to be a duet with Santana.
Kurt and Blaine performed for a socialite, June. She wanted Blaine, but not Kurt. June also wanted Blaine to break off his engagement to Kurt. I don't think that will happen. Blaine lied to Kurt and said that June wanted Kurt to be in a showcase, when June only wanted Blaine. That's not going to go well. I hope it's not a cliffhanger at the end of the season whether Kurt and Blaine break off their engagement.