I would just attend one event from 7-7:25ish and the other from 7:35ish-8. Hopefully that gives you time to get from one house to the other.
Like 33girl suggested I'd politely say to the first house that I have to leave for a different engagement now and compliment them on their event. And for the second house, I'd just apologize for being late and say I had a previous engagement.
I would also have emailed the recruitment chairs of each chapter a couple of days before the parties to tell them that I am very interested, but I have a time conflict they should know about. That way I over all my bases, but I wouldn't say directly I was going to the other house.
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