Provide detail regarding groups of people

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For example, DC27's program had a page that described what the CFP review committee is, along with a name and avatar for each individual on the committee. Other conferences like to provide information about their steering committee, or executive leadership, or various other groups like that.

Potentially also allow a group to be the presenter of record for an event, rather than person(s) directly; this would work well when there are situations such as "Lockpicking Village staff will conduct an intro to lockpicking", and it could be any one or more members of the village staff.