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One way to address this would be to add a field to your form that allows registrants/attendees to identify what segment they belong to. E.g. "I am a...Prospective Student/Current Student/Alumnus" etc.
All of the records would go into the database initially, but if you really don't want to maintain those who aren't "Leads" (however you define that), you could create Smart Campaigns to clear out any undesirable records on a recurring schedule.
More impactful, though, might be to consider ways to set up your database and programs to first segment and then message/market to those "non-Lead" audiences. If nothing else, it'd make it possible to easily report on an event to see what portion of your respondents are "leads" vs. current students vs. community members, so you can understand if the event is really meeting the objectives you have for it.