You may want to send out "Save the Date" postcards instead of a formal engagement announcement. Once you have a date to save, that is.

There is that beautiful Victorian house in Shoreline Park. They rent that out for parties and receptions, and I remember it being pricey for a party, but pretty reasonable for a wedding reception. They have a kitchen, and space for dancing.

I also agree with helblonde about spreadsheets. Channel your inner HRJ!