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We use a custom post type to define events http://codex.ww.wp.xz.cn/Post_Types#Custom_Post_Types

you can modify the labels in file custom-type.php in folder lib/post It starts on line 25

// ===============================
		// = labels for custom post type =
		// ===============================
		$labels = array(
			'name'               => Ai1ec_I18n::_x( 'Events', 'Custom post type name' ),
			'singular_name'      => Ai1ec_I18n::_x( 'Event', 'Custom post type name (singular)' ),
			'add_new'            => Ai1ec_I18n::__( 'Add New' ),
			'add_new_item'       => Ai1ec_I18n::__( 'Add New Event' ),
			'edit_item'          => Ai1ec_I18n::__( 'Edit Event' ),
			'new_item'           => Ai1ec_I18n::__( 'New Event' ),
			'view_item'          => Ai1ec_I18n::__( 'View Event' ),
			'search_items'       => Ai1ec_I18n::__( 'Search Events' ),
			'not_found'          => Ai1ec_I18n::__( 'No Events found' ),
			'not_found_in_trash' => Ai1ec_I18n::__( 'No Events found in Trash' ),
			'parent_item_colon'  => Ai1ec_I18n::__( 'Parent Event' ),
			'menu_name'          => Ai1ec_I18n::__( 'Events' ),
			'all_items'          => $this->get_all_items_name(),
		);