It would really help if you can post your code to some place such as SkyDrive, so that we can understand how you have created the "Events" and "News" section in your Grid App and provide you better guidance in terms of using different templates for different
groups.
Alternately, you could use this link
http://msdn.microsoft.com/en-us/library/windows/apps/Hh972605.aspx that shows how you can assign different templates to different groups.
It sounds like you are assigning the same template to multiple groups which you should avoid, if you want to make them look different.
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