Feature summary (what you would like to be able to do and where): Organizers should be able to enable a field in the Event Registration tool which updates a Wikipedia User Account with an email, if they expect participants to need to be contacted via email.

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):

• As an organizer, I run a Central Notice banner which enables 100s of new users to register for my event. However, over third of them created their accounts with emails attached. If I try to contact the new users with talk page messages, they never see them because they didn't inherit any of the baked in User preferences for notifications related to emails. As an organizer, I just lost 1/3 of possible contributors.
• As an organizer, I plan to have multiple followup communications with participants for an event that includes multiple different sub-activities, including different trainings, with different zoom video links. I need to be able to send a private message to the participants, as we approach the event, that would not be appropriate for public posting.
• As an organizer, an in person event for experienced editors requires additional private information about entering the venue. I know that the fields on the event page are not correct for those instructions, and the venue has been very specific about not posting that information in public. I want to send an email to registered users that we feel comfortable participating in the event, and we have screened for existing Wikimedia experience. However, a non-trivial subsection of those users didn't enable user emails for the account, so the experienced editors don't make it into the event, and try to contact me last minute panicking about getting in, but don't. As an organizer I both burned some of the credibility with my editors and missed out on quality content.

Benefits (why should this be implemented?):

• Increases the likilihood of registered participants enabling email, which creates greater opportunities for followup and other kinds of outreach.
• Users gain access to the features involved in emails, including default notifications, account recovery, etc.