About: http://webisa.webdatacommons.org/99844579

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I do not think it really answers the original question, but then I can not see why you would ever need to test if an object is an event anyway.
http://www.w3.org/ns/prov#wasQuotedFrom	stackoverflow.com