The Hong Kong Databricks FSI Community Day 2026 is a unique, invitation-only event held on a private boat in Hong Kong, distinct from traditional conferences. It facilitates a working exchange for financial professionals dealing with data, markets, risk, and oversight. Organizers have eliminated hierarchies and pitches, focusing on open, critical peer discussions. No speaker attributions or recordings are allowed, ensuring focus on practical expertise. Over thirty technical proposals cover real-world financial architectures, including cross-border liquidity and data isolation. The event is independent of Databricks, serving as an expert-led ecosystem for regional market practitioners. A key focus is high-throughput event streaming architecture for cross-border liquidity intelligence with exactly-once controls. The system preserves source authority, jurisdiction, and event order amidst varying data speeds and finality. Hierarchical routing layers segregate legal entities, workload classes, and business keys. Exactly-once semantics are achieved through a combination of immutable identity, idempotent producers, and transactional writes. Stateful processors continuously calculate liquidity metrics, with snapshots incrementally persisted and validated. A Genie Ontology provides a semantic contract for consistent event interpretation. A market-stress scenario demonstrates the pipeline's ability to handle surges and data staleness. Consumer groups are tuned for bounded event-time lag and deterministic results. A rigorous production change protocol includes schema compatibility, type safety, dual-run environments, and chaos tests. The outcome is a streaming platform that transforms fragmented events into governed liquidity intelligence, making uncertainty explicit for bounded agents and supervisors. Attendees gain practical knowledge on scaling Asian market streams while preserving entity boundaries and deterministic replay.