All makes sense to me! So taking League as a subclass of Event as you've suggested... here's quick stab at what that might look like?

As an aside: In terms of sample data to use for this, GO Mammoth built their own API to publish their data openly (though this was before any OpenActive modelling specification existed so it's not being used as widely as standards-compliant feeds). Based on this, here's a further reference that might be of interest from the archives: gomammoth/opendata#4

Using GO Mammoth and TTR as a basis, below is a very rough initial proposal.

Does this cover all the key properties? Is there anything else we'd want to include with a league?

After this it would be interesting to model a fixture (following your commendation, using https://schema.org/SportsEvent perhaps with beta:thirdTeam too as a beta property)?!)

`League` proposal

This proposal includes the following new classes and properties that are not currently defined in the OpenActive model, which have been prefixed with the superfluous "oa:" in the example below to highlight them:

oa:League
oa:deposit
oa:maximumTeamCapacity
oa:remainingTeamCapacity
oa:numberOfGames
oa:playersPerSide

{
  "@context": "https://openactive.io/",
  "identifier": 40,
  "type": "oa:League",
  "superEvent": {
    "type": "EventSeries",
    "identifier": 102,
    "name": "Summer Season 2017",
    "startDate": "2017-06-27",
    "endDate": "2017-08-29"
  },
  "eventSchedule": {
    "type": "Schedule",
    "startDate": "2017-06-27",
    "endDate": "2017-08-29",
    "repeatFrequency": "P1W",
    "byDay": [
      "https://schema.org/Tuesday"
    ],
    "startTime": "19:00",
    "endTime": "21:00",
    "timeZone": "Europe/London"
  },
  "name": "Netball - Ladies (Battersea Park - Tues - Rec)",
  "offers": [
    {
      "type": "Offer",
      "name": "Individual registration",
      "url": "https://www.gomammoth.co.uk/individual-checkout/?leagueid=40",
      "description": "Sign up and we're place you in a team.",
      "price": "65",
      "priceCurrency": "GBP",
      "oa:deposit": {
        "type": "MonetaryAmount",
        "amount": "0",
        "currency": "GBP"
      }
    },
    {
      "type": "Offer",
      "name": "Team registration",
      "url": "https://www.gomammoth.co.uk/teams-checkout/?leagueid=40",
      "description": "Full team registration.",
      "price": "450",
      "priceCurrency": "GBP",
      "oa:deposit": {
        "type": "MonetaryAmount",
        "amount": "0",
        "currency": "GBP"
      }
    }
  ],
  "oa:maximumTeamCapacity": 14,
  "oa:remainingTeamCapacity": 6,
  "oa:numberOfGames": 8,
  "oa:playersPerSide": 6,
  "description": "Tuesday - Ladies - Recreational",
  "genderRestriction": "https://openactive.io/FemaleOnly",
  "level": ["Beginner", "Intermediate", "A-Grade"],
  "facilityType": [
    {
      "type": "Concept",
      "id": "https://openactive.io/facility-types#a5ac16fe-06ac-4bc1-93f7-69ff3bfcf3b9",
      "prefLabel": "3G Artificial Grass",
      "inScheme": "https://openactive.io/facility-types"
    }
  ],
  "location": {
    "type": "Place",
    "identifier": 18,
    "name": "Battersea Park",
    "description": "A more detailed description of the location.",
    "hasMap": "https://www.google.co.uk/maps/place/Millennium+Arena/@51.4810847,-0.1515177,21z/data=!4m2!3m1!1s0x4876050595ea62f3:0x30b0ae2a271b6275",
    "address": {
      "type": "PostalAddress",
      "streetAddress": "Battersea Park Millenium Arena, Albert Bridge Rd ",
      "addressRegion": "London",
      "postalCode": "SW114NJ",
      "descrition": "Exit Battersea Park or Queens Road...",
      "image": "https://www.gomammoth.co.uk/wp-content/uploads/venue-images/netball/battersea-park/gomammoth-netball-battersea-park.jpg",
    },
    "geo": {
      "type": "GeoCoordinates",
      "identifier": 4326,
      "latitude": 51.4810847,
      "longitude": -0.1515177
    },
    "image": [
      {
        "type": "ImageObject",
        "url": "https://s3-eu-west-2.amazonaws.com/prod-everyoneactive-wp/wp-content/uploads/2018/04/13112215/Acton_HeaderBanner.png"
      }
    ]
  },
  "activity": {
    "type": "Concept",
    "id": "https://openactive.io/activity-list#fbdc35a8-3dd0-40ee-a7ca-6ff40b3e5f90",
    "prefLabel": "Netball",
    "inScheme": "https://openactive.io/activity-list"
  }
}

League proposal

`League` proposal

Uh oh!

Discussion: Leagues and Ringers #144

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