code: func (e Event) Find(alias string) Field {
  	for _, field := range e.fields {
  		if field.alias == alias {
  			return field
  		}
  	}
  
  	return Field{valid: false}
  }
docs: // Find looks up a field value by its alias. This is most useful in pattern
  // subscriptions where might use Find to look up a parameterized property.
  // If the alias does not exist, an empty struct will be returned.