Wisdom suggests that they should be very careful about what invitations they accept; very careful indeed. Because if they're not careful, they might end up with embarrassing news stories like this one from the Marlborough Express (our emphasis added):
New Zealand is in danger of becoming divided between the haves and have nots, Labour leader Phil Goff says.
Eighteen people heard Mr Goff speak at the Marlborough Chamber of Commerce inspiring speaker series at the Marlborough Convention Centre, in Blenheim, yesterday.
Labour is lagging heavily in the polls, however he said he was not despondent, and believed there was still a chance Labour could win the election.
Oh dear. Clearly the lure of hearing Phil Goff speak in the Chamber's "inspiring speaker series" wasn't very inspiring at all!