Yes non-members may attend certain "events" within our convention. Like yours, these would be speaker events, etc. It would not include anything ritual related (initiation, officer installation, etc).
Generally these are spouses or children who attend banquets along with the convention attendee

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I drag my family along to conventions, but they spend their time sightseeing and playing at the hotel while I am in meetings

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"Pam" Bäckström, DY '81, WSU, Dayton, OH - Bloomington, IN
Phi Mu - Love.Honor.Truth - 1852 - Imagine.Believe.Achieve - 2013 - 161Years of Wonderful -
Proud to be a member of the Macon Magnolias - Phi Mu + Alpha Delta Pi