PR campaigning and holidays

So I have been working on a PR campaign for a release of a new product. The product is going to be released the weekend before the 4th of July. Naturally we want the release of our product to be successful and thus are planning an event to celebrate and get the community involved. Should we plan this event to be June 30th (the weekend before the 4th of July) or do you think the event would have better response and involvement within the community by holding it the weekend before (around June 24th)? Any response would be great. The real question is when do you and your friends/family celebrate the 4th of July?

PR facts

Cool PR history facts from Wikipedia--

• Public relations is the art and science of building relationships between an organization and its key publics. It is concerned with communications management.
• PR historians say the first PR firm, the Publicity Bureau, was established in 1900 by former newspapermen, with Harvard University as its first client.
• Ivy Lee, who has been credited with developing the modern news release (also called a "press release"), espoused a philosophy consistent with what has sometimes been called the "two-way street" approach to public relations, in which PR consists of helping clients listen as well as communicate messages to their publics.
• In the words of the Public Relations Society of America (PRSA), "Public relations helps an organization and its publics adapt mutually to each other."