Hi Jennifer
Filtering by tags like this can be tricky. There are a few options here to show you.
First, WordPress itself can combine tags into a single link. See our demo site as an example of 2 different tags combined: http://wpshindig.com/tag/javascript,social/. You could create a button or menu item with that link structure to filter if you’d like. However, this again will show ALL events within that tag.
Another option is to see what Filter Bar can do. We use it on the demo site: http://wpshindig.com/events. It is the 2nd bar on display. This too is going to have the same issue though as the first example.
What might work better is if you create these as categories with a child category (see http://www.wpbeginner.com/beginners-guide/how-to-add-categories-and-subcategories-to-wordpress/). Tags don’t work quite the same way. With the categories approach, you should be able to help filter down to exactly what you are looking for.
Is there anything else I can help you with?
Thanks
Courtney 🙂