MONDAY: >> In one of the strongest bills of the summer, the Pixies and Bloc Party (at left) take the stage at Merriweather Post Pavilion. Gates are open at 5:30 p.m. >> Local rockers Greenland and City-State hit DC9 with Richmond band Conshafter for $6. TUESDAY: >> Arlington punk quartet Four Letter Lies plays with local glam rockers Death By Sexy at the Black Cat. 9 p.m., $5. THURSDAY: >> Bloc Party, post sharing the…