In September 2020, Tan was part of a move to return to 'safe' climate protests. In late 2020, Tan was one of the volunteers who organised "Mock COP26", which had delegates from 140 countries. She also gave a talk at "Mock COP26" on being an activist living where activism is equated with terrorism. Commenting on "Mock COP26" Tan told The Guardian "They're making sure that the voices of the most affected areas are amplified, and making sure that we have a space and we're not just tokenised." She was one of the activists to take part in the Fridays For Future 'Pass the Mic' campaign, also in late 2020, to request that Attenborough pass on his Instagram account to youth advocates, particularly from the Global South.