Retrieve one event by ID — classification, assessment, sources, industry tags, Environmental Nexus Tags (ENTs), bloc analysis, and tier rationale. Use when you already hold an event ID; to find IDs, use search_events. Pass event_id as the zero-padded string (e.g. "06", "141"). date is the implementation date (general availability for a product release). Free tier returns the complete record for sample events and the classification facts for all others (deeper assessment and evidence withheld); full tier returns every field.