Mostest Raised $4 Million to Make Booking an Event as Easy as a Dinner Reservation. What NYC Venues Should Know

NEW YORK — If you’ve ever tried to book a private room for a holiday party in Manhattan, you know the drill: an inquiry form, a wait, a PDF proposal, a minimum spend you didn’t expect and a string of emails before anything is confirmed. A New York startup thinks that process should look a lot more like reserving a table, and it just raised money to prove it.

Mostest, an AI-powered event booking platform, announced on Oct. 27 that it had closed an oversubscribed $4 million seed round at a $16 million post-money SAFE valuation cap. The round was led by Capital Q Ventures, NEXUS Luxury Collection and T-Squared Social, the hospitality and entertainment venture co-founded by Tiger Woods and Justin Timberlake, according to FinSMEs. Wildwood Ventures, Locker Room Capital and Newbond also participated, along with strategic investors and advisors Todd Deutsch, Charlie Walk, Jeffrey Davis and Neal Luthra.

The company was founded by CEO Sarah Klingman and co-founder and CTO Aaron Kennedy. AlleyWatch included the round in its weekly roundup of New York tech deals.

What Mostest Does

Mostest works on both sides of an event. For individuals and corporate customers, it brings venue discovery, pricing, vetted vendors and planning support into one platform. For hotels, restaurants and hospitality groups, the company describes its product as “an always-on AI-powered sales and booking engine” that handles inquiries, generates proposals and captures event revenue “without proportionately increasing sales resources.”

The key distinction, in Mostest’s telling, is that it’s built to complete the booking itself rather than simply pass along leads, the model many event marketplaces have used.

The company reports facilitating more than $126 million in event spend across more than 1,700 events and says it has reached seven-figure revenue at an early stage. Those are company-reported figures; as Dealroom points out, they don’t show how much of that spend the platform itself keeps as revenue or how much business repeats. Mostest says it’s also testing its technology with major hospitality groups, hotel chains and Fortune 500 companies.

Where the Money Goes

According to the announcement, the funding will accelerate the company’s AI development, deepen integrations with hospitality partners, expand enterprise relationships and bring Mostest to more markets.

The investor list is part of the story. T-Squared Social is itself a hospitality and entertainment venture. For a seed-stage company selling to venues, investors who understand the operator side can open doors that money alone can’t.

Why New York Venues Should Pay Attention

For many New York restaurants, bars and hotels, private events are a revenue line that depends on slow, manual sales work. Here’s how to think about platforms like Mostest:

Speed wins the booking. A customer planning a team dinner or birthday often reaches out to several venues at once. The one that replies first with clear pricing and availability frequently gets the deal. If your events inbox sits unanswered over a busy weekend, that’s revenue walking to the restaurant down the block.

Publish your numbers. Platforms built around transparent pricing push venues to define their packages in advance: room capacity, minimums, per-person menus and add-ons. Even if you never use a third-party tool, writing those down speeds up every inquiry.

Know the cost of the channel. Before you sign with any booking platform, ask how it gets paid, whether by commission, subscription or fees to the customer, and who owns the customer relationship and data afterward. A booking that comes with a hefty commission may still be worth it for a slow Tuesday, but not for a sold-out December Saturday.

Keep a human in the loop. AI can draft a proposal in seconds, but event clients often have special requests, dietary needs and budgets that shift. Make sure someone on your team reviews what goes out under your name.

For Founders

Mostest’s raise shows that investors are still funding vertical AI tools aimed at specific, messy workflows in traditional industries, especially when a startup can point to transaction volume and revenue. The SAFE structure is common at seed and lets the company defer setting a price until a later round, but founders should model how a $16 million cap will convert before assuming it’s a straightforward valuation.

What to Watch

Holiday party season makes the next two months a natural test for any booking platform. The signals to watch are which New York venues sign on, whether the enterprise pilots turn into contracts and which new markets Mostest enters next.