One of our favorite resources for figuring out what is going in Buenos Aires is the excellent website Vuenosairez.com. This site really seems to know what's happening. We are loving the interactive map of Buenos of Aires with the different events of the day plotted accordingly. It seems to be presently only available in Spanish, but with minimal skills in Español you should be able to navigate and select the right city and choose where and when you want to head out on the town. Check it out.