Until when can the ITN money be used?

Hi all, Do you know if there is a mechanism by which the money of the ITN can be used for expenses that occur after the 36 months of contract of the fellows? My contract ends in September, but my project only ends in January 2019. I can anticipate that, in this interval of time, there will be some expenses related to the project (for the travel and accomodation of our final meeting; and for the article processing charges of the papers not yet published), that are covered under the Research, training and networking costs. Is it possible to get reimbursed for these expenses after the end of my contract? And if yes, by which institution (I am not sure if my institution gives back the leftover money and to who)? Thank you in advance!