Custom RSS feed for Wordpress

We need custom RSS which we will use for daily newsletter in Mailchimp. Our site uses following plugins: - post scheduler (to set publish in future date) with feature "publish future post now" - post expirator Basically we are running events portal with these plugins, so we need RSS which will show todays events/posts, no matter what publish date was or when it will expire. If posts date range includes todays date, it should be in RSS. Events/posts must be sorted by category and date. You can modify existing wordpress RSS feed if you want ...