i have a friend who once worked as a telemarketer with the same style.. she said there is really a FREE thing but they will force you to join or be a member of their club whatsoever. its really up to you.. kung mahina ka tumanggi dont go nalng. pero if you cant be pushed easily naman, you can grab their free dinner offer. sayang din yun
they are requiring your spouse to be present so that if you decide to become a member (which pipilitin ka talaga nila), you wouldn't have an excuse na "i'll ask my spouse first".
and yes, expect a 1-3 hour seminar/tour ek-ek, that is where the marketing happens.
one more thing, if you're going, dont bring credit card or cash.. or at least dont tell them that you have one. they were trained not to accept NO as an answer. so prepare your big NO after you dinner..