By Oliver · AI Architect, BuildAClaw · Sep 19, 2026 · 10 min read

How to Build an AI Agent That Coordinates Vendors and Tracks RSVPs for Event Planners

A 200-guest wedding involves an average of 14 vendors and 3-6 rounds of RSVP chasing. Here's how one local AI agent replaces the spreadsheet chaos.

A mid-size event planner I worked with in Austin runs 22 events a year. Each one touches an average of 14 vendors — caterer, florist, DJ, venue, rentals, valet, photographer, officiant, transportation — and each vendor needs 3-5 touchpoints before the event date: initial confirmation, deposit reminder, final headcount, load-in time, day-of contact. That's roughly 60-70 vendor messages per event, on top of chasing RSVPs from 150-300 guests who reply by text, email, a Google Form, and occasionally a voicemail. Multiply that by 22 events and you get a planner who spends more time being a human router than a creative director.

The fix isn't another SaaS platform with a per-guest fee. It's a local AI agent that reads every inbox, form, and text thread, keeps one source of truth, and only pings you when a human decision is actually required.

1. Give the Agent One Job First: RSVP Ingestion

Don't try to automate everything on day one. Start with the highest-volume, most error-prone task: pulling RSVP replies out of scattered channels and into one structured record. Guests reply however is convenient for them — a text that says "yes we're coming, bringing my sister," a form submission, a reply-all email. An OpenClaw agent running on a Mac Mini M4 watches a shared inbox, a Twilio or WhatsApp number, and a form webhook simultaneously, parses the free text into structured fields (attending: yes/no, guest count, dietary notes), and writes it straight to a spreadsheet or lightweight database.

This alone eliminates the single biggest time sink planners report: manually re-typing RSVP replies from six different sources into one guest list.

2. Automate the Vendor Follow-Up Cadence

Vendors go quiet. It's not malicious — they're juggling their own event calendar — but a planner chasing a florist for a final flower count three days before the wedding is a stress point that shouldn't require a human to notice the silence. Configure the agent with a follow-up cadence per vendor type:

• Day 0: Initial confirmation request sent automatically once a vendor is booked
• +48 hours, no reply: Automated polite nudge
• +96 hours, no reply: Escalation alert sent to you, not the vendor — you decide whether to call
• 7 days before event: Final logistics confirmation (load-in time, headcount, day-of contact number)

The agent tracks all of this per-vendor, per-event, so you can glance at one dashboard and see which of your 14 vendors are green, yellow, or red without opening a single email thread.

3. Build the Guest-to-Vendor Headcount Bridge

The single most annoying manual task in event planning is reconciling RSVP headcount against vendor orders. Your caterer needs a final count 5 days out. Your rental company needs chair counts 3 days out. Your florist needs a table count. Each of these numbers derives from the same RSVP data but needs to hit a different vendor on a different deadline. The agent should:

• Calculate live headcount totals as RSVPs come in
• Auto-generate and send the caterer's final count email on the exact deadline, pulled from live data — not a number you eyeballed three days early
• Flag discrepancies (e.g., 220 confirmed guests but venue capacity is 200) immediately, not at check-in

4. Generate the Day-Of Contact Sheet Automatically

Every planner builds a day-of run sheet by hand: vendor names, arrival windows, cell numbers, load-in order. Since the agent already has every vendor's confirmed logistics data from step 2, it can compile this into a single PDF or shared doc 48 hours before the event without you touching a spreadsheet. When a vendor updates their arrival time via text the week of, the agent updates the master sheet automatically instead of you tracking version history across email threads.

5. Keep Guest and Vendor Data Off Someone Else's Server

Guest lists contain phone numbers, addresses, dietary restrictions, and sometimes plus-one relationship details that guests didn't consent to sharing with a third-party SaaS vendor's cloud database. Vendor contracts contain pricing you don't want scraped into someone's ad-targeting pipeline. Running the agent locally on a Mac Mini M4 means that data lives on hardware in your office — not on a platform that can get breached, sold, or have its pricing model change on you mid-season.

6. Start Small, Then Layer in Complexity

The planners who get the most value don't try to automate their entire workflow week one. Start with RSVP ingestion (step 1) for a single event. Once you trust the data going into your guest list, add the vendor follow-up cadence for that same event. Only after both are running smoothly should you connect the headcount bridge and day-of sheet generation. This staged rollout mirrors what works in other operational automation — we saw the same pattern hold when building reorder-point agents for distributors in this piece on wholesale reorder automation: one workflow proven end-to-end beats five half-wired ones.

Frequently Asked Questions

Can an AI agent actually call or text vendors, or just track them?

It can do both. With OpenClaw wired into a phone/SMS gateway or email, the agent drafts and sends the outreach, follows up on a schedule, and logs every response. For voice calls, most planners still route through a human, but the agent prepares call scripts and flags who needs one.

How does the agent handle RSVP tracking across email, text, and forms?

It watches a shared inbox, a form webhook, and an SMS number simultaneously, parses free-text replies like "we'll be there, +1" into structured guest count data, and writes it to one spreadsheet or database in real time.

What happens if a vendor doesn't respond?

The agent runs a follow-up cadence you define — typically a nudge at 48 hours and an escalation alert to you at 96 hours — so nothing falls through the cracks without you manually tracking dates.

Is my guest and vendor data safe running this locally?

Yes — that's the core advantage. Guest lists, phone numbers, and contract terms stay on a Mac Mini M4 in your office instead of a third-party SaaS server. Nothing leaves your network unless you explicitly connect an outbound API.

How much does it cost to run compared to event management software?

Most planners report $35-$55/month in token costs running on a Mac Mini M4, versus $200-$600/month for per-seat event platforms that charge by guest count or vendor volume.