In Jainism, there have been 24 Tirthankaras. There is no recognized 25th Tirthankara in the traditional Jain canon as of today. Some later writings or folk beliefs may speculate about future prophets, but the canonical sequence ends with Mahavira as the 24th. If you meant something specific (a festival, a calendar date, or a hypothetical future Tirthankara in a particular Jain tradition), please tell me more so I can address that precisely.