Is there a way to use text values from an event's attributes to look up placenames and append geometry to the event? Example could be a Tweet that has no location coords but where the sender mentioned a placename in the text of the tweet or set a user location. Could you use those values to guess the location by using a gazetteer or similar lookup?
There is no built-in GeoCoder in the GEP. The quickest way to do this would probably be to add a custom processor that called out to the Esri Geocoding Serivce and requested coordinates from a description.