EventOS is a full-stack event management and POS platform built with Next.js 15, React 19, TypeScript, and Supabase. Key Features: • POS Billing Terminal with multi-payment mode & instant receipts • Event Booking calendar & status workflow • Staff attendance, daily wages & salary payroll • Expense tracking & 6-month financial charts • Bilingual customer portal (English & Tamil) • Photo gallery with watermark overlay • White-label ready with 30+ Postgres tables Includes 1-click live demo bypass!