addFav(name, performer, category, room, abstract, begin, dis, color, btn, id`){
try{
  this.afs.doc(`users/${this.user.getUID()}`).update({
favs: firestore.FieldValue.arrayUnion({
  name,
  performer,
  category,
  room,
  abstract,
  begin,
  dis,
  color,
  btn
})
  })
}

deleteFav()
{
  try{
this.afs.doc(`users/${this.user.getUID()}`).update({
  favs: firestore.FieldValue.delete()
})
  }
}