Sadly youve got no chance
Parkinson's Disease is a horrible condition, have you looked on the likes of you tube for videos of Michael J Fox? theres a few of him talking about his condition and its sad to see someone you love from films in your childhood looking so ill and a virtual prisoner in his body. It might sound selfish but I wouldnt want to meet MJF this way, the chances of him signing autographs is slim due to his parkinson 'shake' , the chances of a talk for any length are slim as it has effected his speech as well as the condition causing fatigue, and saying you would just like to shake his hand (no pun intended) turns it into some kind of victorian freak show
Muhammad Ali is a sporting hero of mine but would I want to meet him? again no, I want to remember him as the greatest. Looking at him now almost brings me to tears, not because I feel sorry for him, but because a man who did so much, who influences so many, ended up in this condition, not through an accident or injury but because he was one of the unlucky few