How to use condition for row invisible and visible

Question

SELECT uniquiID,

CountryFlag,

EventImage

,CONVERT(varchar(50), StartDate) as StartDate

,CONVERT(varchar(50), EndDate) as EndDate

,EventName

,Description

,CountryCode

,Remark

,Flag

FROM TradefairData

 

this my table-

and my flag column value is -   Null

                                                   0

                                                   1

                                                   Null

                                                   0

                                                  1

 

Then i Want to Know how to Use case when flag=1 then 3rd and 6th row invisible when flag=0 then all row visible else all row visible please help me

 uniquiID is my uniqueId Column