Date deadline
In order to allow Principal Investigators more flexibility and to better facilitate interdisciplinary research across engineering disciplines, the Directorate for Engineering is removing deadlines for submission of unsolicited proposals to all core programs in CBET, CMMI, ECCS and EEC, effective August 15, 2018.
Read the letter here: https://www.nsf.gov/pubs/2018/nsf18082/nsf18082.jsp