Do you know how to show user pictures that are attending Event in Views please?

For the view Commons Events - Upcoming Events (Content)

I displaying the list of event results using

Format: Unformatted list
Show: field panels

Relationships

(author) OG membership: OG membership from User

Content: Author

Field:

(author) User: Picture (Picture)

I can only get the arthor of the node photo
to show the not the photos of those attending the event

Many Thanks for your help

Comments

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By using the

"Registration: User field"

I can get the Registration users id' to show
but not their photos. any idea's please?

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