I have done this where either an event is in just part of a building, or you want to retrict public access to reception areas etc. Simply assign a tag to those APs and set the SSID to only be enabled on APs with tag X.
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You can access Cisco Dcloud and search for Meraki, there you can access some labs. To do this you need to have an account created with Cisco. https://dcloud2-sjc.cisco.com/content/catalogue?search=meraki&screenCommand=openSearchScreen
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