From @peiraisotta document:

• Organizers and Members groups affiliation is linked to their wp.profile
• When organizing or attending an event, the activity is shown in the wp.profile
• Organizers and Members groups affiliation is linked to their wp.profile

and other features related to user accounts

Integration with the WordPress.org user accounts for:

• login/logout
• add as organizers once a group is accepted by the Community team's Event managers, and add them as admin in their group (see issue [WP Event managers][Meta] Group creation #4 )
• add an activity in their profile when they publish an event
• add an activity in their profile when they host an event (not always the same person as the one who publishes)
• add an activity in their profile when they attend an event (attendees)
• add an activity in their profile when they speak at an event
• list which group(s) they are organizer/member of on their profile
• More? please add in the comments

Some of these features are similar to how works the WordCamp Network, such as "Confirmed as a speaker for [event name and link]"

Related to:

• My comment on Five for the Future repository on: Add activity when Meetup organizers host events #192