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Migration now tries to find an Event object before instantiating on
up
This allows migration to continue when an event has multiple instances.
See also #66 (comment)
Steps for verifying migration:
before pulling down latest changes
bin/rails db:rollback STEP=1
--this sets it so we have multiple old events with the same name but different yearsafter pulling down latest changes
repeat as above, but the migration will succeed because it will try to find an existing event before attempting to instantiate it