Here are reputable end-to-end corporate event organisers you can contact (Australia first, then global firms). Each entry includes a short note on what they offer and a source you can check.

Australia

• Spark Event Group — full-service event management (strategy, planning, operations, production) across major Australian cities. (sparkeventgroup.com)
• Keito Events — corporate conferences, launches, registrations, speaker/venue management and full delivery. (keito.com.au)
• Evoke Experiences — one‑stop for event curation, logistics, marketing, PR and financial management (retreats, multi‑day conferences, bespoke experiences). (evokeexperiences.com.au)
• Eventpod — corporate hospitality, team building, sporting/cultural corporate experiences and end‑to‑end program delivery. (eventpod.com.au)
• GEMS Event Management Australia — end‑to‑end conference and event management (registration, virtual/hybrid delivery, secretariat services). (gemsevents.com.au)
• Sabre (Sabre Team Development / Esprit) — long‑standing Australian team‑building and corporate development provider with full delivery services. (en.wikipedia.org)

Global / Large multinational firms (operate in Australia or globally)

• George P. Johnson (GPJ) — global experience marketing and event management agency offering end‑to‑end design, production and digital integration. (en.wikipedia.org)
• Jack Morton Worldwide — full‑service event marketing and corporate event production (live, hybrid, virtual) including creative, production and platforms. (jackmorton.com)
• CWT Meetings & Events — global meetings & events division offering strategic meetings management, event production, venue sourcing and integrated travel + event services. (cwt-meetings-events.com)
• BCD Meetings & Events — global event design and delivery (meetings management, incentives, large conferences, bespoke program delivery). (bcdme.com)
• MCI Group — global engagement and events agency providing end‑to‑end conferences, staging & production, digital platforms and association management. (mci-group.com)
• Freeman — integrated event services (AV/production, design, event technology, registration and full program management). (freeman.com)

Quick checklist of what to ask these vendors (so you compare like‑for‑like)

• Examples/case studies of similar events (size, industry, ROI).
• Full scope they’ll manage (strategy, supplier sourcing, staging/AV, talent, registration, travel, on‑site operations, post‑event reporting).
• Technology stack (registration platform, apps, virtual/hybrid capabilities, data/export).
• Team you’ll get (PM/senior lead, day‑of crew) and point of contact.
• Pricing model and inclusions/exclusions (fixed fee vs. percentage vs. a la carte).
• Sustainability / compliance credentials and insurance.
• References and recent client contacts.

If you’d like, I can:

• shortlist 3–5 of these specifically for your city (e.g., Sydney, Melbourne, Brisbane), event size and budget; or
• draft an RFP template you can send to them to get comparable proposals.

Which would you prefer?