[EventCalendar] Looking backwards in time? - if statements

[Steve Logan]

As aside to the main thread...

>>     <!-- The Loop -->
>>     <?php if (have_posts()) : ?>
>>        <?php while (have_posts()) : the_post(); ?>		 
>>
>>           <?php if ( in_category($this_cat) ) : ?>
> 
> What? Putting an "if ..." inside your loop is not a good idea. Imagine
> what happens if the first 10 posts fail your 'if' criterion. If
> $this_cat is not 2, then why not...

Why is putting an 'if' inside The Loop not a good idea?

Surely if a post fails the loop then nothing gets printed.  If they all 
fail then I get nothing printed - which might not be pretty but isn't 
fatal.  Or am I missing something??

Thanks

Steve