Add field for event organizer users

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (61b47f9) 88.20% compared to head (0eb55bb) 88.20%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3496 +/- ## ======================================= Coverage 88.20% 88.20% ======================================= Files 665 666 +1 Lines 21060 21069 +9 ======================================= + Hits 18575 18584 +9 Misses 2485 2485 ``` | [Files](https://app.codecov.io/gh/webkom/lego/pull/3496?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webkom) | Coverage Δ | | |---|---|---| | [.../events/migrations/0037\_event\_responsible\_users.py](https://app.codecov.io/gh/webkom/lego/pull/3496?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webkom#diff-bGVnby9hcHBzL2V2ZW50cy9taWdyYXRpb25zLzAwMzdfZXZlbnRfcmVzcG9uc2libGVfdXNlcnMucHk=) | `100.00% <100.00%> (ø)` | | | [lego/apps/events/models.py](https://app.codecov.io/gh/webkom/lego/pull/3496?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webkom#diff-bGVnby9hcHBzL2V2ZW50cy9tb2RlbHMucHk=) | `97.19% <100.00%> (+<0.01%)` | :arrow_up: | | [lego/apps/events/serializers/events.py](https://app.codecov.io/gh/webkom/lego/pull/3496?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webkom#diff-bGVnby9hcHBzL2V2ZW50cy9zZXJpYWxpemVycy9ldmVudHMucHk=) | `96.96% <100.00%> (+0.03%)` | :arrow_up: | | [lego/apps/events/tests/test\_events\_api.py](https://app.codecov.io/gh/webkom/lego/pull/3496?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=webkom#diff-bGVnby9hcHBzL2V2ZW50cy90ZXN0cy90ZXN0X2V2ZW50c19hcGkucHk=) | `89.39% <ø> (ø)` | |

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