In the spring of 1967 at the University of Michigan, ARPA held its yearly meeting of the "principle investigators" from each of its university and other contractors. Networking was one of the topics brought up at this meeting.

ACM Symposium on Operating Systems Principles in Gatlinburg, Tennessee (October)
First design paper on ARPANET published by Larry Roberts: "Multiple Computer Networks and Intercomputer Communication
First meeting of the three independent packet network teams (RAND, NPL, ARPA).