Asking the client, “Is there anything else you want to be sure we discuss during our meeting?” is:

a good idea, because you get the client’s input which makes the client feel like he is being listened to. – CORRECT
a bad idea, because it gives the client unnecessary control of the meeting.
a good idea, but only if you know the client will not bring up any concerns.
a bad idea, because the client may feel you do not know what you are doing.