Event shape

Events returned by Momentra are normalized to a consistent shape. Fields appear only when available. Here’s a real indexed event from Howe Library (Hanover, NH):

{
  "title": "Calligraphy Practice Meet-Up",
  "description": "A monthly informal calligraphy meet-up and social gathering for practicing calligraphy and lettering art, discussing tips, and working on calligraphy projects. All levels are welcome, no experience is required, and attendees should bring their own calligraphy and lettering supplies; the event is held in the Murray Room.",
  "website": "https://thehowe.libcal.com/event/16071917",
  "more_info_website": null,
  "ticket_url": null,
  "open_to_public": true,
  "rsvp_required": false,
  "startDate": "2026-10-04T12:00:00-04:00",
  "endDate": "2026-10-04T13:30:00-04:00",
  "eventStatus": "EventScheduled",
  "attendanceMode": "OfflineEventAttendanceMode",
  "address": "13 South Street, Hanover, NH 03755",
  "venue": {
    "name": "Howe Library",
    "address": "13 South Street, Hanover, NH 03755",
    "latitude": null,
    "longitude": null
  },
  "organizer": { "name": "Howe Library", "url": null },
  "performers": [{ "name": "Laura Di Piazza" }],
  "offers": [
    {
      "name": "Admission",
      "price": 0,
      "priceCurrency": "USD",
      "availability": "InStock",
      "url": "https://thehowe.libcal.com/event/16071917"
    }
  ],
  "isAccessibleForFree": true,
  "cost": "Free",
  "categories": ["Arts & Crafts", "Community & Recreation"],
  "image_url": "https://d68g328n4ug0e.cloudfront.net/data/feat_img/5761/16063/1729525749.jpg",
  "event_id": "16071917",
  "is_online": false,
  "schedule": {
    "type": "recurring",
    "startDate": "2026-10-04T12:00:00-04:00",
    "endDate": "2026-10-04T13:30:00-04:00",
    "occurrences": [],
    "recurrence": { "pattern": "monthly", "frequency": 1, "resolvedZone": "America/New_York" }
  }
}

Field notes

title, description.
startDate, endDate — ISO 8601 with timezone offset.
venue (name, address) and a top-level address.
Pricing: isAccessibleForFree, a human-readable cost, and structured offers[] when a price is published.

The three distinct link fields

Each link field has a distinct role. A field is only populated with a real link of the correct type — generic pages (home, newsletter, collections) and non-link text are never placed in these fields.

Field	Meaning
`website`	The event’s own detail page on the organization’s site.
`ticket_url`	An external ticketing / registration / RSVP page, when linked.
`more_info_website`	An external organizer / venue info page, when linked.

more_info_website is the signal seed_brief uses to detect an aggregator: an aggregator’s events mostly carry an off-domain more_info_website.

Fields on matched events (MCP)

Matched events from matching_events additionally carry score (brief similarity), startEpoch, and facets (the precomputed facets used by the facet gate). The facets object uses singular event-field names: age_band (string), commercial_intent (string), religious_content (string), programming_nature (string), access (string[]), audience (string[]), event_categories (string[]). See Brief shape for the vocabularies.

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Core concepts

Field notes

The three distinct link fields

Fields on matched events (MCP)

​Field notes

​The three distinct link fields

​Fields on matched events (MCP)

Field notes

The three distinct link fields

Fields on matched events (MCP)