outgoing.go
func (ov *OutgoingVenue) SetFoursquareID(to string) *OutgoingVenue {
	ov.FoursquareID = to
	return ov
}
func (ov *OutgoingVenue) SetFoursquareID(to string) *OutgoingVenue {
	ov.FoursquareID = to
	return ov
}
// SetFoursquareID sets the foursquare ID for the venue (optional).