Wow, I am envious of your opportunity. I grew up a big Willie Mays fan in the 60s. My first baseball game was Giants vs Cubs at Wrigley when I was about 6 or 7 years old. I remember crying when the Giants lost and Willie didn't hit a home run. Later, after Willie retired I became a Cubs fan by default because their games were always on TV. I did have the opportunity to meet Ernie Banks outside of Wrigley one time. He's a very gracious man and a great ambassador for the Cubs and baseball in general.
Congrats and enjoy yourself. Sey Hey and let's play two!