We could bump it to Monday.  Not everyone has off though, and I kinda hate to interrupt the flow.  I know the fireworks here don't start until nearer to dark, and the barbeques and stuff are all earlier in the afternoon.  If there are a lot of conflicts with the 4pm time, we can move it to Monday or Saturday, but if it looks like most people can make 4 on Sunday, we might just keep it.  
Thoughts? Input?