What’s on your radar? Here’s what we’ve got: FRIDAY: Mike Watt, formerly of the Minutemen, hits the Black Cat this evening at 9:30 p.m. $10. De La Soul with Butta Verses and ESL’s Thunderball and Federico Aubele at the 9:30 Club. Doors open at 10 p.m. $20. In a Halloween state of mind? Why not try a Capital Hauntings Walk? The creepy tour leads you through the Lafayette Square area, where, it’s claimed, “restless ghosts…