
Just wondering, is it required not to have the "th" in the date? Or would it also be okay to say "February 18th referendum"?

Either way sounds okay to me. In fact, your suggestion sounds more like what I would probably say colloquially.
Indeed, if the date were February 1, 2, or 3, I think I would feel obligated to say "February first", "second", "third". Due to that, I think I will change this to say "18th".
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追加:kebukebu, 2010年9月12日
リンク:TRANG, 2011年2月20日
編集:kebukebu, 2011年2月20日
リンク:kebukebu, 2011年2月20日
リンク:AlanF_US, 2015年9月4日