The Indian wedding and event planning industry, valued at over INR 3 lakh crore annually, remains largely fragmented and dependent on manual processes. This paper presents Happenings and Happiness, a comprehensive dual-role Android application that digitizes the complete wedding planning lifecycle for both event organizers and service vendors. The system integrates Firebase Firestore for real-time data synchronization, Firebase Cloud Messaging (FCM) V1 API with JWT-based OAuth2 authentication for push notifications, RazorPay payment gateway for secure transaction processing, and Cloudinary for cloud-based media management. The application implements real-time bidirectional chat, vendor discovery and booking management, guest list management, budget tracking, and an earnings analytics dashboard. The dual-role architecture supports seamless interaction between users and vendors within a single application while maintaining strict role-based data access through Firestore security rules. Performance evaluation demonstrates sub-second message delivery in real-time chat, reliable push notification delivery across both user roles, and consistent UI performance across Android 10–14 devices. The system addresses critical gaps in existing wedding planning applications by providing an end-to-end digital solution tailored for the Indian market.