This Catalyst demonstrates how communications service providers (CSPs) can deliver seamless, high-performance connectivity for mega events through a value-driven, agentic AI Marketplace. Large-scale events span multiple venues and involve complex, multi-vendor environments across stadiums, transport corridors, broadcast hubs, and public spaces. Today, fragmented OSS/BSS processes and manual coordination make it difficult to provision and operate advanced services such as 5G network slices, private networks, DAS, Wi-Fi, and edge computing—leading to delays, SLA breaches, and lost revenue opportunities. The proposed solution introduces a multi-agent AI Marketplace where autonomous AI agents represent vendor capabilities and collaborate under defined policy guardrails. Using TM Forum Open Digital Architecture and Open APIs, agents dynamically compose, order, and operate event-specific connectivity solutions in real time. An agentic orchestrator negotiates bids from domain agents, validates compliance through policy agents, and triggers provisioning across partners, while monitoring agents continuously adapt services to changing conditions such as crowd surges or latency drift. This enables rapid, resilient, and SLA-assured delivery of mission-critical event services. Innovation lies in combining agentic orchestration with marketplace economics. The platform supports usage-based, outcome-based, and subscription monetization models, enabling CSPs to monetize premium slices, edge compute, immersive fan experiences, and data products. Governance and safety guardrails ensure controlled autonomy, with human-in-the-loop oversight for critical decisions. Beyond technology, the Catalyst drives organizational transformation by introducing AI agents as digital co-workers, shifting teams from manual coordination to AI-assisted ecosystem delivery. Success is measured by the ability to orchestrate multi-vendor agents at scale, dramatically reduce provisioning time, maintain broadcast-grade performance, and ensure compliance across dynamic event environments. Ultimately, the Catalyst provides a reusable, standards-based blueprint for CSPs to evolve from connectivity providers into ecosystem orchestrators—unlocking new revenue streams, accelerating time-to-value, and delivering exceptional experiences for event organizers, broadcasters, and fans.