My Novel is Speeding Toward the End!

Things are happening too fast in my NaNo novel! I have to write 50,000 words. I'm at almost 21,000 and the events are hurtling toward the end at a faster speed than I want. The way it's going, I could be finished at about 35,000 words. I need to figure out a way to flesh it out a little. Grrrrrr.