From Huffington Post:
Congressional Democrats took over the House floor Wednesday in a 'sit-in' demonstration over Republican leaders’ refusal to hold a vote on gun legislation.
Their efforts to achieve this goal continued throughout the night, even after the Republican lawmakers snuck into the chamber at 2:30 a.m. and voted to adjourn the session until Jul. 5."
C-SPAN broadcast the scene by using a Congressman's Periscope feed after Congress was declared in recess. Majority Leader Paul Ryan called the move a "publicity stunt."
Although Speaker of the House had the chamber cameras turned off, Democrats are broadcasting the ongoing sit-in via cellphone camera.