EventsRepo.kt

fun getEventsDB(): LiveData<MutableList<Event>>{
val data = MutableLiveData<Mutablelist<Event>>()
val myList = mutableListOf<Event>()
FirebaseFirestore.getInstance()
            .collection("events")
            .get().addOnSuccessListener {
                // Get results
               FirebaseFirestore.getInstance().collection(id).get().addOnSuccessListener {
               ...
               }.addOnFailureListener{
                 ...
               }
            }.addOnFailureListener{
                // Handle exceptions
            }
  return data
 }