
Yingluck is facing charges of negligence for failing to prevent corruption and irregularities in a rice-pledging scheme while she was prime minister.
The Supreme Court’s Criminal Division for Political Office Holders will deliver its verdict in the case on August 25.
“To show support for her tomorrow is like sending a signal,” said the source, who asked not to be named. “But to show up on the verdict day means that they want to show that they stand by Yingluck.”
The source said the party would not mobilise a mass of supporters.
People would come to Bangkok on their own, with local leaders organising their travel, the source said.