Are seminars beneficial ?
Yes, they are very beneficial
How much can you learn in a couple days ?
You will learn ALOT! Will you remember everything? Probably not. I attended a week long Arnis camp in Chicago last year. It was great! Sooo much stuff to learn. I also took many notes, as well as getting together with my Inst, and video taping what we did during each segment. Chances are, that you'll see the same material again at futrure seminars. Its better to take a few things, and really work them, then trying to remember everything. Just my opinion.
I can see where it would help if you were currently studying the style based on the seminar, but what if you wasn't !
Well, that might be a little hard. I went to a Combat Hapkido seminar, a long time ago, taught by John Pellegrini. No background in Hapkido at all, but then again, it wasnt your trad. Hapkido anyway. The locking techs. that he taught were very similar to the FMA that I have been training in, so I was able to adapt fairly easy. Then again, nothing wrong with getting a taste of something new. Again, as I said above, if you learn one thing, then IMO, it was worth it!
Would it benefit the student who was interested in other arts but never studies them ?
Yes! ANYTIME you have a chance to learn something new, its making you better.
Would it help someones skill level in the art being taught ?
Absolutely! I walked away with SOOO much from the arnis camp. My skill level went up so much after that week.
It's just hard to phathom what a couple days can do for the martial artist. Lets say I've never studied BJJ and that there is not any BJJ schools near me, but there is an upcoming Royce Gracie seminar in my area, would it be beneficial for me to attend ?
Dude, having any ground skill is gonna help you. That is something that I have been preaching to the stand up guys for a long time---the importance of learning about the ground game. DEFINATELY attend the Gracie seminar. Will you be able to walk out and defeat someone on the ground? Probably not, but its a start in a very good direction! Are there any BJJ schools near you? If not in the same town, how far would you have to drive to get to one?
I hope that this was of a help to you! Go to as many camps/seminars that you can. Not only will you be learning something new, but you'll have the chance to meet so many great people.
Mike