HELP! My fiancée and I are getting married in October. Our caterer has advice us to order the wedding cake at least 4 months before the wedding. But the problem is we are expecting our wedding invitations card to be printed by the month of august. So how can we order the cake before sending out the invitations? I think this makes no sense. How do we know how many people will attend, therefore what size cake is needed? We are expecting 120 guests. Any suggestions on how to determine what size wedding cake to order? Please help we need wedding cake ideas.