Forty rallies will be held across the U.S., including ones in Kokomo and Fort Wayne.
A group of supporters met over the weekend to plan a separate "traditional prom" for Sullivan High School students that would prohibit gays from attending.
The Indiana legislature will likely vote again next session on a constitutional amendment banning same-sex marriage.
Their federal lawsuit claims administrators blamed Young for the bullying for being too flamboyant.
The Indiana Youth Group's license plate was banned because they allegedly did not follow BMV procedure.
The proposal would provide benefits to same-sex partners of city and county employees.
Brown, Floyd, Marion, Monroe and Vanderburgh counties have a higher percent of same-sex households than the national average.
According to a study done by the Gay Lesbian Straight Education Network in 2009, ridicule towards gay or lesbian students is still prevalent in schools.
The committee voted 8-4 along party lines Monday to approve a resolution defining marriage as solely between one man and one woman.