Hi,
try this :
1. Export the event layer to [shapefile_name].shp
2.create a layer file ([shapefile_name].lyr) from the event layer (it includes all definitions : Symbology, labels, ...)
3.load the new [shapefile_name].lyr into your map
4.change the data source of the layer added from event_layer to the shapefile_name.shp
(open the new featureclass and assign it to the featurelayer)
pFClass = pFworkspace.openfeatureclass(....)
pFLayer.featureclass = pFClass
5.refresh the map and the legend
good luck