select and post information form other websites?

This may or may not relate directly to wordpress. What I am trying to do is point to, and pull from, specific websites. In some cases certain information like event and dates. Then I would like to post them on my website in relation to the content, or maybe in just a widget on the sidebar. I want this automated. I want to set the sites or categories from a site.

I am not really sure if such a thing exists, and I have no idea what to search for if there is such a thing that exists.

Any help would be appreciated.