'Please be advised that' is an example of business English which is now going out of use. We like to encourage the use of plain English these days.
You can ignore it and just start reading at 'We've scheduled ....'
You don't need to use this sort of construction in your own writing, but if you feel the need to add something like this, you could say 'Please note that...' or 'I'd like to inform you that...'
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