Django: Failure to render Request Context

I have this in my views.py:

def announcements(request):
    return render_to_response('events.html', {
        'posts1': Blog.objects.filter(category__title="Announcements")
         }, context_instance=RequestContext(request)
    )

And this in my base.html:

{{ posts1 }}

But nothing from the above request context gets rendered when I load the home page.

Edit 1:

It looks like I am on a wrong path here. My aim is to display the posts under "announcement" category throughout my开发者_运维百科 website in a fixed sidebar. Whichever page is opened the sidebar in that page should contain only posts from "announcement" category. Any suggestion for how to achieve it?

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Create an inclusion template tag and use it in templates where you want to display that sidebar.