The Month Header Plugin
Plugin Name: monthheader
Purpose: (New in version 3.0) To show a horizontal list of months at the top of the calendar month to enable a one-click display of any month.
After installing and enabling the plugin, you will need to enable the month header in the view under the plugin settings for the view. This plugin is aware of the starting month of the year from the calendar view settings. For example, if your calendar year starts in July (a school, for example), The month header will begin with the July month.
This plugin uses the same header area in the calendar as the photo header plugin. If you are using the month header and photo header plugins together, you can change the order of display by changing the plugin order in the Joomla plugin manager.