Translation of concord in German

It looks like we need to invite Erika again to my home, once the cake is ready. Of course, this should be done before Sunday to stay in the chocolate cake race. We should buy cream too.
Yes, but I was unable to work on this yesterday, and today will be almost impossible too. Between tomorrow and Sunday you'll have quite a few more entries in the system. I just wanted to know how it is going.
Thanks for the corrections and for accepting my friends request. You are completely right: Spanish grammar is simpler than German grammar. I was just looking for a job where both languages are required.