Tracking signups in my scout ledger

example.ledger

2021-07-22 * Alice | Paid for camp
    Events:Summer camp 2021:Alice                   $-50 ; flow: in
    Assets                                           $50

2021-07-23 * Bob | Paid for camp
    Events:Summer camp 2021:Bob                     $-50 ; flow: in
    Assets                                           $50

2021-07-24 * Charlie | Paid for camp
    Events:Summer camp 2021:Charlie                 $-50 ; flow: in
    Assets                                           $50

2021-07-25 * Alice | Refund for camp
    ; Couldn't go due to conflicting event
    Events:Summer camp 2021:Alice                    $50 ; flow: in
    Assets                                          $-50

2021-07-26 * Camp | Pack camp sign-up
    ; receipt: 123
    Assets                                         $-100
    Events:Summer camp 2021:Bob                      $50 ; flow: out
    Events:Summer camp 2021:Charlie                  $50 ; flow: out

2021-07-27 * David | Paid for camp
    ; late signup
    Assets                                           $50
    Events:Summer camp 2021:David                   $-50 ; flow: in


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$ hledger-event -f example.ledger
┌────────────────────╥───────┬──────╥──────┐
│                    ║ recvd │ paid ║ held │
╞════════════════════╬═══════╪══════╬══════╡
│ Events············ ║  $150 │ $100 ║  $50 │
├────────────────────╫───────┼──────╫──────┤
│   Summer camp 2021 ║  $150 │ $100 ║  $50 │
│     Alice········· ║     - │    - ║    - │
│     Bob··········· ║   $50 │  $50 ║    - │
│     Charlie······· ║   $50 │  $50 ║    - │
│     David········· ║   $50 │    - ║  $50 │
└────────────────────╨───────┴──────╨──────┘

---

$ hledger -f example.ledger bal
                 $50  Assets
                $-50  Events:Summer camp 2021:David
--------------------
                   0