Would you expect to pay for your own drinks?
Nice venue, good live band, decent buffet all (obviously) paid by the host. In your world does the host also pay for all drinks, a first drink for everyone, drinks up to a certain limit or do guests just pay for themselves?
If it makes a difference birthday boy (60th) has said absolutely no guests please.
I suspect answers will be dependent on social class or regional so fwiw most guests will either be skilled and fairly affluent working class or lower middle class.