The protesters are standing in silence to shed light on Wanchalearm's disappearance a year ago. He was an outspoken critic of the military regime of Prime Minister Prayut Chan-ocha.
Among those attending are his sister and his girlfriend.
Protesters have lit candles in front of the BACC. The message is simple: Stop Enforced Disappearances.
Everyone deserves to live free of the threat of state-sanctioned violence.
The faces of Wanchalerm are still all over social media today. The pro-democracy protestors still remember him well even one year on because justice has yet to be served.