The management of academic and inter-college events traditionally relies on manual registration systems, spreadsheet maintenance, and disconnected online forms, which often result in inefficiencies and lack of transparency. This paper presents 'Signature', a comprehensive Android-based event management application designed to automate registration, payment processing, participant verification, and analytics. Developed using Java and XML in Android Studio, the system integrates Firebase Realtime Database for cloud-based synchronization and Razorpay for secure digital transactions. The application implements a role-based access model consisting of User, Coordinator, and Admin roles. Unique QR codes are generated for each participant to enable digital verification during events. Experimental deployment within a college-level environment demonstrates improved operational efficiency, reduced manual errors, secure transaction handling, and real-time data accessibility. The system provides a scalable, user-friendly, and secure solution for digital transformation of event management processes.