There are amateur radio activities that don't necessarily fit into the "session" scope that are still interesting. For example, there is the AMPRNet [1], a TCP/IP over AX.25 block of the Internet on 44.0.0.0/8. There is a similar effort called Hamwan with its Puget Sound Data Ring [2].

[1] https://www.ampr.org/

[2] http://hamwan.org/