This forum is manned by volunteers with staff popping by to help when can't. They tend not to work on weekends, so if they aren't here to see your support request then even citing urgency is not going to be any use. Sorry, but that's just fact.
And whoever tries to help you needs to know whether you are blogging on WordPress.com or WordPress.org. It sounds to me like you're self-hosted as, to my knowledge, blogs here don't have a maintenance mode.
If you are self-hosted, then you need to ask your question on the correct forum as we cannot help you here.