Not sure why that is showing up as "System.Binary". In .net terms it is a byte array.
That field corresponds to a SQL Server "timestamp" column. It is essentially a last-modified time for that record, though it is not based on calendar/clock time - it's more like a counter that SQL Server automatically increments when a row is updated. The only thing about an event that could change after it is inserted is the Acknowledged field. Most likely you can ignore it - EventTime is the time the event occurred.