It’s always interesting to see the communication strategy (?) of a board. Don’t publish an agenda of a public meeting to early (only the evening before the event) to certainly avoid to get people from the public into your (public) board call.
The next communication step should be to complain about the lack of participation from the public.
If the communication of a board follows this road it has not to wonder about a lack of participation from the public. The public wouldn’t feel invited.