Answer for Where do I enter membership on a committee for a conference?

This would be entered under PROFESSIONAL COMMUNITY ACTIVITIES (aka external service>community service:non-patient care).  In one case above the workshop is the entity, and the committee name and location would be entered in the description field. In searching for the International Dry Eye Workshop it looks like it is a separate entity.
If the conference is organized by a membership society/organization the society/organization would be the entity and it would be entered under Professional Organization & Scientific Activities with the conference and committee name in the description.  That is the case for the TFOS International Workshop on Contact Lens Discomfort- it is organized by the Tear Film & Ocular Surface Society (TFOS).