Hi Hua,
In addition to the contributions to science that a researcher may list, you can also list a product that resulted from your work. Products can include publications; patents; audio or video products; conference proceedings such as meeting abstracts, posters, or other presentations; patents; data and research materials; databases; educational aids or curricula; instruments or equipment; models; protocols; and software or netware.
I-Corps is a training program, so it should not be listed as a Contribution to Science. If the hackathon resulted in a product, I would recommend you add that.