Embodiments of the present invention provide a method, system and computer program product for automated data updating of notices in a calendaring and scheduling (C&S) system. In an embodiment of the invention, a method for automated data updating of notices in a C&S system can be provided. The method can include composing a C&S document in a C&S system executing in memory by at least one processor of a computer. The method further can include noticing different users addressed for the C&S document and adding to the C&S document a reference to variable data stored separately from the C&S document. The method yet further can include detecting a change in the variable data. Finally, the method can include transmitting notice to the different users of the change in variable data. In one aspect of the embodiment, transmitting notice to the different users of the change in variable data can include flagging the C&S document as having changed.