Hi Yohanan,
Welcome back to our forums!
You can add multiple dates to a single event by using the recurring events feature (under the TIME & DATE section, click “Schedule multiple events”). Unfortunately, adding multiple venues to a single event is not supported at this time.
For your particular case, a good solution may be to create individual events so that you can separate out which times go with which venues, and then use categories/tags to group the events. If you’d like to display these “groups” on your site, you can use the Events Lists/Events Calendar widgets and filter by the category/tag.
I hope this helps! I’m sorry I don’t have a better answer for you, but please let me know if you have any questions!