While the GDPR has been discussed at a high level of panel sessions and the fact that it got a well deserved attention within the community at the last meeting. I would not know if a webminar specifically on this has been conducted. The implication of the compliance and regulatory fine and impact on registries needs sensitization also within the process of ICANN community at the capacity building level.
Also, i understand that the RDS will replace WHOIS as a result of the enforcement of the GDPR in 2018 this topic and sensitization needs to be considered and discussed extensively even for registries.