The DRD events are defined in the /usr/share/evm/templates/clu/drd.evt template file. Below are the registered DRD events.
# evmwatch -A -i -f "[name *.drd]" -t "[@priority] @name" [200] sys.unix.clu.drd.server_add [200] sys.unix.clu.drd.server_leave [200] sys.unix.clu.drd.new_accessnode [300] sys.unix.clu.drd.no_accessnode