Need some advice please. Have organised a party for ds2, in approx 2 weeks. Gave out invitations 2 weeks ago. Put on invitations, on the RSVP space: By 04/08/2014 please, 0XXXXXXXXX, thank you.
Nine children invited, at $30/child, as including birthday boy, ten was minimum number allowed. Was fair bit over budget, but for many reasons (moved continents recently, I am having treatment for breast cancer), willing to stretch where possible. Problem is, three of nine have RSVP'd, and tomorrow morning will obviously be 04/08 (in Aus btw). Just not sure WTD now??
I don't have contact details of the children/parents who haven't replied. As my son is only going to be 9, he doesn't seem able to establish who actually will/won't be there.
I really don't want lots of expensive spaces at the party to be wasted (and hardly any people there!) but don't think I can invite alternative guests in case the original invitees turn up! 
WWYD?? Starting to stress now!