How To change Excerpt Length Depending on the page

I have some code displaying excerpts in the side bar – I want the snippet of the post to be a different length to that displayed when you go to the events category page.

I have this so far in my functions.php file but it doesn’t work.

function custom_excerpt_length($length) {
    if (is_page('Events')) {  //For the events page
        return 65;
    } else {
        return 40; //for all others pages
    }
}
add_filter('excerpt_length', 'custom_excerpt_length');

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