You can't have an RSS Feed from the Upcoming Events block, but one for the Latest News is quite simple...
1. RSS syndication needs to be enabled in your main Moodle site - go to the main Miscellaneous section in the main Admin Variables page - http://yourmoodle/admin/config.php#configsectionmisc and make sure the 'enablerssfeeds' switch is set to Yes.
2. Go to the Admin Modules page and select the Forum Settings - http://yourmoodle/admin/module.php?module=forum and make sure the 'forum_enablerssfeeds' switch is set to Yes.
3. Go to your site news forum and click on 'Update Forum'.
4. You will see two options for RSS feeds: one for the activity and one for the number of posts. 'Discussions' means that generated RSS feeds will include new discussions in the forum with their initial post. 'Posts' means that generated RSS feeds will include every new post in the forum. The number of posts is up to you - but it needs to be at least 1
Have a look at the following pages in the Documentation:
Hope this helps