Not much to add really, except be enthusiastic (confidence rubs off on others) and be open to suggestions rather than defensive, even if they criticise something you've done. They're not your supervisors so you don't have to actually listen to their suggestions if you (and your supervisors) don't want to.
But I'd agree with missspacey - they might not have read your report very thoroughly in which case, don't be disappointed - it's just a formality to some people, it doesn't mean they're not interested to hear what you're doing.
Don't forget to let us know how it goes :-)