Esri's help for this method specifies this as LPUNKNOWN, which is rather unhelpful since I don't speak COM. I've tried an envelope, a geometry, and a graphicsContainer; each time receiving "System.ArgumentException: Value does not fall within the expected range.". Can't find any meaningful examples. Here's my MCVE . . .

IMap newDataFrame = new Map
    Name = "New Data Frame",
    SpatialReference = CurrentMap.SpatialReference
var viewRefresh = (IViewRefresh) newDataFrame;
var graphicsContainer = (IGraphicsContainer) newDataFrame;
var pointMaker = IdioticThingWithWhichYouNeedNotConcernYourself();
for (int i = 0; i < 5000; i++) 
    IMarkerElement element = pointMaker.MakePoint(out var envelope);
    graphicsContainer.AddElement((IElement)element, 0);
    // Also tried viewRefresh.RefreshItem(envelope);

I figure it's questionable (at best) to refresh even a tiny portion of a map 5000 times, but this is just tinkering so please humor me on that point. Regardless, the exception noted above is thrown the first time through the loop.

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