All changes regarding the schedule of the conference (e.g. cancellation of presentations, change of rooms, etc.) will be updated currently. The information is identical to the programme updates of the scientific program and are available at the scientific programme in other formats as well (ordered by publication date, filterable by conference part and as an rss-feed).
A form is available here for submitting changes, cancellations, updates, etc. to your contribution.
Please note that your participation in the conference is not automatically cancelled if you cancel your contribution. Further information on this can be found under the menu item "Cancellation of participation".