It would be helpful to have dynamic blocks that can be time and/or date based. If the send date and time are in the specified time and date range then show this block otherwise show default content for block. This would be useful for marketing our services with some date based control such as Tax Assistance would only be shown if the date was between Jan 1 and April 15. This would be useful if we could add LibCal events into these blocks which would be date and time based as well. Such as show a list of upcoming events that are within the next week of the send date of the email.