Organizations give you a record for every company and partner your venue works with, separate from the individual people who represent them. Sponsors, agencies, and vendors get their own profile, auto-enriched with logos and firmographic data so the record is complete without your team typing it in by hand.
Partner relationships outlast any single contact. When a sponsor's point of contact moves on, the organization record keeps the history, logo, and firmographic data in place, so your team is not rebuilding context from scratch every time someone changes jobs.