I'd be happy to help you with that! However, as an AI language model, I don't have access to specific historical events that took place in New Jersey on February 15. However, I can suggest some ways of finding interesting facts about this date in New Jersey's history.

1. Check historical newspapers or archives: Local newspapers often report on events that happened on specific dates. Try searching for newspapers published in New Jersey on February 15 and see if there are any interesting stories or events reported.

2. Look for historical milestones: February 15 may be the date of significant milestones in New Jersey's history. For example, it may be the date of the state's admission to the Union, the signing of an important legislation, or the birth of a prominent New Jerseyan.

3. Consult history books or documentaries: History books and documentaries may provide more detailed information about events that took place on February 15. They may also offer insights into a specific era or period in New Jersey's history.

4. Check with local organizations or museums: Local organizations and museums may hold events or exhibitions related to New Jersey's history. They may be able to provide information on events that took place on February 15 or offer suggestions on where to find more information.

5. Conduct online research: Finally, conducting online research using search engines or historical databases may yield interesting facts about February 15 in New Jersey's history. You could search for specific keywords such as "New Jersey history February 15" or "significant events in New Jersey on February 15."