Consulta de SQL y campos fecha

[bendark23]

intente con esto,

Código SQL:

SELECT *
FROM EVENTS WHERE event_type = 270 AND
        eventdate >= DateAdd(YEAR,DateDiff(YEAR,0,Getdate())-1,0) 
GROUP BY  identity_id,DATEADD(DAY,6,eventdate)
 

pero me sale este error

Column 'BH_EVENTS.event_id' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.