Installation for WP: Just unzip and add eventpress to your wp-content/plugins folder. Theme files for the default plugin will be picked up from within the plugin automatically.
For BuddyPress, you need both bp custom posts and eventpress. Add both to the plugins folder.
If you also want to try the debugger, add kb_debug.php directly to mu-plugins.
I’ll get around to updating http://kunal-b.in/eventpress/ with more details in some time.