HTTP status codes 302, 303, 307 for upcoming page?

see: [url]http://en.wikipedia.org/wiki/List_of_HTTP_status_codes#3xx_Redirection[/url]

I’m unsure of which to use, I have a events calendar which uses the GET method, if a user manipulates the url to navigate to a month prior to the first event’s month I issue a 301 and redirect them to the first month. However, if a user attempts a url after the last event’s month I need to issue a temporarily unavailable header prior to redirection. I’m a bit unsure if I should issue a 302, 303 or 307.

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