Piwik introduced its Event tracking function from v2.0. But Now v2.4 available. But still no deep event tracking document available. So I'm going to post about it. From this post you can learn about basic Piwik analytic (_pa) 's event tracking. I explain this with two simple examples. Official basic guide available here.
In further post, I'll explain about Tracking Events with HTTP API, and event report.
If you wish to use Piwik in your site free, Please submit your request here. Use comment box for technical helps. Here, my old Analytic posts are available.
Viewing Events Reports
Go to Piwik. In the menu click Actions and then Events.
Now let's see Piwik Event tracking in a useful action.
Now you learn how to use Piwik in efficient way. You can use pa event in various purpose.
Convert ga Event Tracking to Piwik
On internet, you can get thousand of Google analytic event tracking plugins for ga.js and universal.js analytics. You can easily convert them to Piwik.