Adding conditions

Is there a way to add conditions to the simple sidebar widgets?

The site structure is like so:
I have a category page for “Paris” which displays all Paris related blog posts, under Paris I have categories like “Travel guides, food, attractions” and the blog posts fall under the appropriate categories.

What I’m trying to do is create a sidebar with a condition to only show on all blog posts under the Paris category. So Paris’s unique tag id is “tag_ID=36”. Is something like this possible?

The page I need help with: [log in to see the link]