The Mississippi Picnic in Central Park -- do you have any memorabilia?

I have a project that perhaps some of my fellow Mississippi State alumni can help with.

Many MSU alumni in the NYC and northeastern US area are familiar with the "Way Up North in Mississippi" Picnic that happened in Central Park every summer from 1980 to 2015. My aunt & uncle helped start that event that lasted for 36 years.

The family is trying to assemble a complete collection of the t-shirts that were produced each year from 1980 until 2015. They are missing three: 1982, 1983, and 1984.

If you happen to have one, or know of one, would you please contact me?

Thanks!