We won't know abouit that until we have seen the Sue Grey report.
I would like to think so but I really can't see her report being anything more than confirmation that there were gatherings but it's inconclusive as to whether or not they were illegal.
SG has zero investigative power beyond talking to the people that may have attended. We may be lucky and she has got hold of some concrete evidence that someone has leaked to her but I doubt it.