I am having some problems about event calendar module. I hope someone can help :)

I extended the Calendar class,

class ExhibitionHolder extends Calendar
{
	static $has_many = array (
		'ExhibitionPages' => 'ExhibitionPage'
	);
}

class ExhibitionPage extends CalendarEvent
{
	static $has_many = array (
       'ExhibitionDates' => 'ExhibitionDateTime'
	);
}

In the ExhibitionHolder.ss I want to list 5 upcoming events if there are no dates clicked.

<% if Events %>
<% control Events %>
$_Dates $EventTitle $Link
<% end_control %>
<% else %>
<% control ExhibitionList %>
$Title <% control Dates %>$StartDate.Nice<% end_control %> <% control Dates %>$EndDate.Nice<% end_control %> $Link
<% end_control %>
<% end_if %>

The following function returns the list of all Exhibition Pages as expected. But I when I try to sort them using StartDate. I get error. When I use ID in the join, I get error 'Column 'ID' in on clause is ambiguous'. When I use ExhibitionPage.ID, I get error 'Unknown Column ExhibitionPage.ID'.

function ExhibitionList($num=5) {
	return DataObject::get("ExhibitionPage", "", "CalendarDateTime.StartDate ASC", "LEFT JOIN CalendarDateTime ON CalendarDateTime.EventID = ID", $num);
	}

Any help will be great.

Ok, it was an unnecessary problem. Events module shows the upcoming events by default, in the calendar home page. I couldn't see them because it's listing only events for upcoming 6 months. And I was having events for 2012. You can change 6 months to anything you want in the Calendar.php file line 41.

static $defaultFutureMonths = 6;