Change event query to filter by 'ends_at'

[VibroAxe]

Resolves #68

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (dbcf2c2) to head (43f4c09).

Additional details and impacted files

@@             Coverage Diff             @@
##             develop       #69   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity      1155      1155           
===========================================
  Files            136       136           
  Lines           4053      4005   -48     
===========================================
- Hits            4053      4005   -48     

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[VibroAxe]

@mintopia can this be merged?