While Thailand is celebrating Loy Krathong Festival around November each year, the Thai community in Sydney has an unrelated event, Thai Food Festival, in Tumbalong Park, Darling Harbour. This year features Thai Prawn Showcase to promote the export.
One trick I learned is to stay around until the party is over. The stalls are willing to lower the food price rather than pack the food back even though there is not much left to scoop.