Curse of the Mekong

* Live music and free hot dogs? What’s not to love? Del Ray celebrates Independence Day with a neighborhood festival, 6-9 p.m. [City Guide]
* It’s official: brother/sister duos (pretend or not) make the best music. The Fiery Furnaces bring their psychedelic rock to DC. $15 at 8 p.m. [Black Cat]
* If you’re finished celebrating the 4th of July already, you might be a communist. The musical “1776″ has extended its run through July 7th. $30, 8 p.m. [Keegan Theatre]
* Continue getting your theater on with “The Importance of Being Earnest,” one of two Oscar Wilde works you’ve heard of. [Keegan Theatre]
* As long as you’re being cultured, enjoy the Smithsonian Folklife Festival. This year, it celebrates the Mekong River, Northern Ireland, and Virginia. 11 a.m.- 5:30 p.m. [Smithsonian Center for Folklife and Cultural Heritage]