TATHACK '26 is a national-level hackathon organized as part of Tathva '26 at NIT Calicut. It features an online Round 1 on 27 September 2026 and an offline Grand Finale on 9–10 October 2026. Participants compete in teams of up to 4 for a ₹1,00,000 prize pool with an entry fee of ₹150 per participant.