Change Calendar of Event - Scriptable

//this is to change the calendar of a calendar event

let event = await CalendarEvent.today()
//log(event)

let cal = event[0]['calendar']
//log(cal)




var calcal

await Calendar.forEventsByTitle('Family').then(successCallback)

event[0]['calendar']=calcal
log('line20')
log(event[0]['calendar'])
event[0].save()

async function successCallback(result) {
  calcal = result
  console.log(calcal)
//   console.log(calcal[0])
  console.log(calcal.title)
  //calSet(calcal[0])
}