A family member is celebrating a birthday, so I've invited her and her DH for dinner on Sunday along with DD and her family. The menu will be a leak tart, corned beef, cabbage, potatoes, with a local dairy's Irish cream and Guinness ice creams for dessert.
I've just learned that, because of a death in the family, her relatives' family, not mine, several people from that branch of the family who live across the country will be here. I've extended the invitation to her sister and BIL, who have accepted. I've also invited them to bring any of their adult children who will be here; when I spoke with them yesterday, their children's plans were not finalized, partly because of the weather conditions yesterday and partly because the haste of making the plans and resulting lack of communication that ensued.
My problem is that several of these adult children (six who will be here) were vegetarian when last we were together. I know that at least a few if them no longer are. So I have eight confirmed meat-eating guests who will be here plus a possible additional one to six, some of whom may be vegetarian. The funeral will be this afternoon so I won't have a firm head count until this evening at the earliest, and at that time I still won't know definitely if anyone will be a vegetarian.
I am very conscious of my guests' dietary constraints and always prepare my meals accordingly, but switching to a menu where meat is not the centerpiece (and flavors the side dishes) will mean a huge amount of work for me on short notice and possibly would be for naught.
What is the etiquette-approved course of action in this case?