How can you control or schedule the SSID availability on specify MR APs? You can for all tagged APs under SSID availability however, it applies to all those tagged APs.
you will need to add a tag to the APs that you want a specific SSID to be broadcast on then you set the SSID to only broadcast on APs that have that tag, this is the only way that I know of doing it.
One thing to watch out for here is the 15 SSID limit. Have run into the situation in hotels and shared offices where the expectation was that there is an infinite amount of SSID's that can be broadcast according to tagging. You are still limited to 15 SSID's per network.