It promises those who sign up that “you'll get a free lunch and a chance to meet and interact with Iowa GOP staffers.”
Of course, the Vatican insists that there is really no such thing as a free lunch when it comes to the road to heaven.
This is all to suggest that as with most important matters, there is no free lunch.
Something had without paying for it; an uncompensated pleasure; a perquisite or gratuity •The date shows the first occurrence of the saloon-food sense mentioned in the etymology: pushing the free lunch
[1854+; fr the former custom of giving customers free food called free lunch in saloons]