Howdy Nora,
Great questions. I’ll answer them one-by-0ne.
1. For Community Events, are you able to add more than 1 image? If so, how many images are you able to add? What are the recommended dimensions or max size?
Folks are limited to one “featured image”, this is the same as a WP featured image of which there is only one. They can show more images in the content body, but they are not able to upload them to your site and thus must have them uploaded to another site like imgur.
2. Are you able to “feature” an event and have it always show at the top of a category? If so, how many “featured” events can you have?
Featuring events like that is not currently a feature of our calendar. If you would like to see us add this though please do make it a feature request: UserVoice (feature suggestion page for The Events Calendar)
3. Are community business who submit an event able to provide links to their social media platforms? Or just their website?
By default it is only their website. However you can add more fields including social media ones. That would be no problem.
Does that all make sense and paint a clear answer for you? Please let me know.
Cheers!
– Brook