[Enhancement] Add a "Number of venues" field to the event tracker for Campus Connect events

[Piyopiyo-Kitsune]

Summary

Add a numeric field titled Number of venues under the Venue section in the event tracker.

If feasible, this field should only appear and be required when the event is set as a Campus Connect event.

Problem

Campus Connect events may take place across multiple venues, but the current event tracker does not include a dedicated field to capture the number of venues involved. This creates a gap in event data collection and reporting.

Proposed Solution

Add a numeric value field called Number of venues in the event tracker under the Venue section.

Preferred behavior

• Show this field only when the event tracker is set to a Campus Connect event
• Make the field required when the event is set to a Campus Connect event

Minimum acceptable behavior

• Add the Number of venues field under Venue even if conditional display/required logic is not currently possible

Expected Behavior

When creating or editing a Campus Connect event:

• organizers/admins can enter a numeric value for Number of venues
• the field is required for Campus Connect events
• ideally, the field is hidden for non-Campus Connect event types

Notes

• The field should accept numeric values only
• Confirm whether the field should allow only whole numbers
• Confirm whether a minimum value of 1 should be enforced
• If conditional logic is supported, tie visibility and validation to the Campus Connect event type

[dd32]

Is this a duplicate of #1604 in a simpler way?

[Piyopiyo-Kitsune]

This is not a duplicate, but an additional field. It'll inform the "participating institutions" stat in this page https://wordpress.org/education/campus-connect/

#1604 will help with the campus outreach efforts.