The true story is probably that this is the only convention and they are giving the attendants a line as well as the elders if the attendants pursue it to that point (they will read your badge for your congregation name).
Sisters are counseled not to wear spaghetti strap dresses and the brothers probably arent wearing suitcoats or a tie.
The days of many JWs having to go to a 2nd convention because of working is less and less with the "simplification" of the conventions.
It must be bad enough if they are going to read this at a Sunday meeting and aren't waiting for the service meeting. Heavens, the "public" might find out that the JWs have flaws.
Blondie