If you know who's going to be at the Q&A beforehand, do your research and see if you can find their contact info before. If you can't find it or don't know who's going to be there, then DO NOT ask in front of the whole room. Instead, after, if they stay to meet and greet, thank them for answering your question, tell them you plan to implement their advice and then ask if their contact information is listed on their Guild's website because you'd like to follow up with them about your results or to contact them if you have questions in the future. If they say no, (that it's not listed at the Guild), have a notepad ready, perhaps they'll see it and offer up contact information or you may have to ask if it's okay to follow up and ask how they'd like to be contacted.
Be as discreet as possible so people around you don't start asking for the same information, putting the person in an uncomfortable situation.
To stay current on The Greenlight Coach's speaking engagements, recommendations, and work success articles, sign up for her free newsletter at the top of the page and get a complimentary 1-hour MP3 on The 5 Fastest Ways to Get Work In Entertainment
www.theGreenlightCoach.com FIND MEFor more tips and articles by top entertainment industry career coach, The Greenlight Coach, visit