If you’re trying to extend the reach of your student or professional EA group, consider running a large speaker event. Local groups often use these events to recruit new members by following them with a more thorough introduction to EA in a discussion group setting. Speaker events are particularly good to advertise at a student activities fair.
These events generally feature a keynote speaker who appeals to a large local audience — a well-known professor, local public figure, or professional in your field — while being relevant to EA in some way. Groups often start the event with an introduction-to-EA talk; the Centre for Effective Altruism offers to fly one of its team members out to give this talk and help with event curation.