The conference drew over 1,000 attendees.
This use of the word attendee seems wrong. I usually think of the "ee" suffix as indicating the subject or recipient of an action. (An employee is one who is employed, a payee is one who is paid, etc.) In the given sentence, it sounds as though the conference is seeing to the needs of the people who were there, when the meaning is probably intended to be "more than 1,000 people were there".
I would expect that the correct word to use here is attender, as in "one who attends". (Not attendant, "one who accompanies".) Is this a situation where the incorrect form is used so much that it becomes correct through force majeure? Is it not actually an instance of the "ee" suffix at all?