Thanks! Looks good!
This seems to be exactly the thing i am looking for. I changed the events-search.php to display checkboxes – and i also tried to add the word multiple to the select box, however, it seems that the search function only searches for just one category (because i haven´t changed the SQL-Query yet to make use of the category[]-array – as you described in your first post).
My problem: i just do not know where the sql-query is located or what and where i exactly have to add some code to get the multiple select running.
hey wattagan! i would also need to select multiple categories in the search form. did you ever found a solution for that?