Specify category id in SafeCracker

{exp:safecracker channel="events" return="someGr/someT/URL_TITLE" url_title="{segment_3}" }
    {category_menu category="1|2"}
        <label for="categories">Categories</label> 
        <select name="category[]" id="categories" size="4" multiple="multiple">
            {select_options}
        </select> 
    {/category_menu}
{/exp:safecracker}