One thing is showing a warning in the templates and hiding any buttons, another thing is really disabling the related views. Some hints that might get you started: http://ezpedia.org/wiki/en/ez/read_only_site. Instead of disabling module views that allow for changes to be made, you can also remove all policies that allow a user to make any changes from any assigned roles.
If you want to be completely sure that there are no modifications made to the database, I also recommend you to remove certain privileges from the database user (like INSERT, UPDATE, DELETE).
If you have got access to your webserver config (a plain .htaccess is enough), you could simply redirect all user requests to a courtesy.html page while the upgrade is in process
Principal Consultant International Business
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