How to view the tags for event RSVPs
There is a configuration that admins can enable on the settings page labelled "Show all tags on supporter profiles”. If you turn that on for your SupporterBase then an extra tag display will appear for each supporter, which is also included in the RSVP listings on event pages. You can see an example of that for this test event in the demo account: https://demo.supporterbase.com/en/supporter_groups/1/events/1.
One thing to note about that is that it will include all tags for each supporter, not just those associated with tag filters.