Which seminar? Airnc, WAI, OBAP?
Just bring a nice resume and a cover letter; also several recommendations if you know pilots working at the specific airline.
Make sure you run a spell check and then ask your friends to double check your documents once again for any grammatical or spelling errors.
Show up with a big smile and tell them you'd like to know how you may join their team? Ask for advice, suggestions, etc. They are usually pretty straight forward if you do not meet their minimums, etc. Good luck!