At any given moment the movement's anthem "I Love Red Shirts" booms from a dozen different after-market audio systems. I've tried capturing the energy of the rallies through this video. Most footage is from Sept. 19; a few shots come from Oct. 10 (The looming art deco that is Democracy Monument should help with distinguishing the two.)
Some thought the government broke the back of the red-shirt movement in May when soldiers swept it from the Thai capital's occupied commercial district.
Absent direction from neither its jailed leaders nor the opposition political party which shares their goals, the movement had become frayed, disorganized and demoralized.
On Sept. 19, after weeks of rebuilding their profile and presence, a massive red-shirt rally marked the five-month anniversary of the crackdown and delivered a reminder to the capital -- and themseves -- of their strength.
Despite the imposition of an "emergency decree" throughout much of Thailand that limits rights of assembly and gives Thai authorities broad powers, red shirts were allowed to gather under the nervous eyes of residents and others anxious to avoid a repeat of this past spring's violence, which killed 91 people.
The demonstration also coincided with the four-year anniversary of the military coup which deposed Prime Minister Thaksin Shinawatra, who most red shirts seek to return to power.
What was to be a caravan tour to memorialize sites where red shirts had lost their lives earlier this year broke down at the same intersection around which they'd built fortified barricades and occupied for weeks.
Their numbers shut down the streets. They tied a lattice of red ribbons to swing over Ratchaprasong intersection and sang and danced into the evening.
This wasn't part of the plan approved by authorities, but it delivered an abrupt reminder to Bangkok that the protesters maintain the ability to seize territory at any time.
Just as riot police assembled nearby and talk turned to the possibility they would reclaim the area, the crowd dispersed before 8 p.m.
Other rallies have followed in recent weeks, including a large gathering on Oct. 10 at the Democracy Monument, where the first night of violence occured in April. Red shirts have sought to shape their public image by capturing symbolic dates and locations. Oct. 10 was the 34th anniversary of the execution of dozens of unarmed students by security forces and right-wing paramilitaries at a nearby university.
These rallies were a return to the festive and enthusiastic tone of the spring engagement's initial weeks, which waned after the first spate of violence on April 10.
Most notable however was the striking amount of negative sentiments and hostility expressed toward the monarchy, in a country where doing so is a serious crime.
Through words and graffiti, people openly expressed antipathy toward members of the royal family, which is somewhat shocking in a country which cultivates and perpetuates the idea that reverence toward the throne is universal.
Most of those attending were Bangkok residents instead of the rural Thais who converged on the capital earlier this year. And for most, the rallies served to reignite their morale through a politically charged party.