Were you thinking you could subvert the rules by not telling anyone where the meeting is taking place?
Of course you have to tell people where the meeting is taking place. The Public Bodies (Admission to Meetings) Act 1960 sets out what you have to tell people:
[public notice of the time and place of the meeting shall be given by posting it at the offices of the body (or, if the body has no offices, then in some central and conspicuous place in the area with which it is concerned) three clear days at least before the meeting or, if the meeting is convened at shorter notice, then at the time it is convened;]
[public notice of the time of the meeting and, if the meeting is to be open to the public, how to access the meeting, must be given by publishing it electronically at least three clear days before the meeting or, if the meeting is convened at shorter notice, then as soon as reasonably practicable;] [(but see subsections (4ZA) to (4ZC) for further provision in relation to notices of meetings of certain bodies in Wales)]