Do you avoid "UI" in event names?

No "UI" in event names, the event raiser should be unaware of the UI in MVVM and user controls The handler of the event should then do something on the UI.

private void RaiseUIUpdateBidButtonsRed() { 
  if (UIUpdateBidButtonsRed != null) {
    UIUpdateBidButtonsRed();
  }
}

private void RaiseSelectedLotUpdated() {
  if (SelectedLotUpdated != null) {
    SelectedLotUpdated();
  }
}