Relocate "associated pages" module for Events to more prominent tab

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When creating an event, a user needs to explicitly note what pages the event will appear in. This is done in a new event draft by clicking the **Related** tab and populating fields with nodes under **Associated pages**, which is required for publishing.

For the majority of the content types, "Related" tends to mean "everything we couldn't put in the previous tabs; kind of a miscellaneous catch-all for information we need to add to the page. For something as pivotal as, "The event needs to show up on THIS page." I feel it needs a more prominent spot in an earlier tab (Overview or Details).

This will require some thought because under **Overview**, there are a number of areas dealing with Organization pages:

1. Participating organizations
2. Organization(s) (for relationship indicator)

It may be a bit confusing to have so much attention paid to _Organization_ pages; order will matter and so will subheadings.

I recommend considering moving **Associated pages** to an earlier tab and renaming it to "Pages for displaying event" or something like that. "Associated," to me, isn't descriptive enough (until you read the help text -- "Please select the page(s) where this event should appear.")

Review the event creation flow, especially the Related, Overview, and Details tabs, and compare the Associated pages fields with the organization-related fields. Clarify the preferred tab, ordering, and label with project stakeholders. Done means the placement and wording make the publishing requirement prominent without confusing it with organization relationships.

Written by the indexing model from the issue text.