2016 All-Star Game Volunteers? Really?

I received this email the other day. It doesn't really apply to me since I'm in PA. but....

Register to volunteer for MLB All-Star Week now View as web page    |   February 17, 2016 Volunteer Registration With Spring Training just around the corner, it is time to start dusting off your volunteer hats and prepare for the All-Star Week Volunteer Program. MLB and the San Diego Padres are looking for unpaid volunteers to help with events during All-Star Week in downtown San Diego. The MLB All-Star Week experience features multiple events for fans of all ages. All volunteers must be 18 years of age at the time of registration and other conditions apply. Sign up today for this once-in-a-lifetime opportunity before registration closes. Register Now

So my first thought was is this even legal a Multi-Billion dollar industry MLB looking for free labor for an event their putting on and charging money to attend every single thing they do in that city for the week?  Just seems strange that they can charge and make millions of dollars in a city and use there fan base for free labor and then when the week is over leave town?  Would think they would need to pay something in business and politics I hear is a "Minimum Wage"(See Below article). Then I started thinking that the PGA does this ever week when putting on tournaments. So I guess what I'm asking is for comments as to any thoughts on this and wondering how I can open up a business get free labor and charge for something?

A City of San Diego Minimum Wage Increase Veto Referendum ballot question will be on the ballot forSan Diego voters in San Diego County, California, on June 7, 2016.

A "yes" vote would approve the city council's minimum wage increase ordinance approved in 2014, increasing the city's minimum wage to $11.50 per hour by January 2017.

A "no" vote reject the minimum wage increase.

This measure was designed to allow voters to decide whether to keep or reject the city council's minimum wage increase ordinance — known as the Earned Sick Leave-Minimum Wage Ordinance — that was approved in 2014. The ordinance set wages to increase according to the following schedule:^[1][2]

• $9.75 per hour on January 1, 2015
• $10.50 per hour on January 1, 2016
• $11.50 per hour on January 1, 2017
• wage attached to inflation beginning on January 1, 2019

The ordinance also guarantees the opportunity to earn at least five days of sick leave for most employees.^[3]

After original council approval, a veto from the mayor and council re-approval, this referendum was put before voters by a signature petition drive organized by the San Diego Small Business Coalition and heavily backed by the San Diego Regional Chamber of Commerce.^[4][5]

Petitioners submitted signatures for a state minimum wage initiative, which is called "The Fair Wage Act of 2016" and was designed to increase the statewide minimum to $15 per hour, provided it reaches the ballot and is approved in November 2016.