Can't say 'No'

Now's Thursday night and Lavigne's party is in 3 days. I'm almost done with the goodie bags, shopping for food and other preparation. Then I received a call. One of her schoolmate's mum rang me and asked if it's still alright for her son to come. My answer? 'Of course he can! If he's interested and keen to come, yes, please do.' How can I possibly say 'no' to her? I certainly don't want to disappoint a little boy. Furthermore, any parent may think it's just one extra person so it won't make a lot of difference to the preparation. But! I had only taken into account the confirmed list of guests coming when making the goodie bags and stuff. I didn't make many extras, only one(!!!). My intention was to prepare 2 or 3 other extras (just a simple bag with some treats) for siblings of guests who may turn up. Now that all my 20 goodie bags are taken up, I have no extras for even one guest who may turn up without RSVP. Adrian was asking me today if anymore are coming since there were a couple who had only confirmed they are coming recently. I was thinking it was not likely since it's so close to the date. Apparently in UK, the traditional party is for parents to leave the children behind and they will pick them up when it ends. But I thought 3-4yr olds are still quite young so I encouraged parents to stay. Some parents will be bringing their other children, some are bringing spouse. I really hope I'll pull through this one. On a brighter note, the weather forecast for Sunday is quite good. Hope it stays that way. 2 Singaporean families are coming (fab!) all the way from London. One I know and have met before, the other's an online friend. Isn't Internet a wonderful thing?