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As the presentation is a future event, it would best be listed under the Research category. After you describe the research, in the same space state that the data (I presume it's an abstract?) is accepted for presentation by your PI at xxx Conference, in XXX City, on XXX date, and that you are first author.
If the abstract is eventually published in a national journal, you can advise schools by update letter that you have a first-author Publication at that time.
Thanks for the advice, much appreciated.
