You can by using the rest search command. Your users might need admin privileges to run the rest command, but this would work:
| rest /services/search/tags
Here's a really simple self-contained example using Sideview Utils modules to present a simple interface where you can search on one tag at a time and look at the events. Should give you some good ideas.
<module name="Search" layoutPanel="panel_row1_col1" autoRun="True"> <param name="search">| rest /services/search/tags | fields title</param> <module name="Pulldown"> <param name="name">tag</param> <param name="label">Search on a tag:</param> <param name="valueField">title</param> <param name="template">tag::$value$</param> <module name="Search"> <param name="search">$tag$ | head 1000 </param> <module name="Events"></module> </module> </module> </module>
Note you would need the latest Sideview Utils app from the Sideview site to run this example ( http://sideviewapps.com ) .
Unfortunately my answer may have been a bit too optimistic. I looked into it a bit more, and there are some problems. One problem is that /services/search/tags will only get tags that have been exported to system level. If you want the ones that are still in an app, you need to pick an app, AND pick a username -- "/servicesNS/