Editor’s Note: This week’s agenda was compiled by DCist staffers Kyle Gustafson, Tom Lee, and Sommer Mathis. This week kicks off at the 9:30 Club with a doubleshot of artists from Wales. One is legendary, one should be (and might be yet). One is proud of their Welsh heritage, one not so much. One has panties thrown at him on a regular basis, the other throws carrots at their audience on a regular basis. Tuesday:…