Event planner here with 12 years of experience dealing with venue contracts. The cancellation policy dispute is one of the most common issues I see, and 110K is a substantial amount. Let me share what I have learned from being on both sides of these disputes.
Venue cancellation policies are often one-sided and can sometimes be challenged as unconscionable, particularly if the venue retains 100 percent of the deposit regardless of how far in advance you cancel, the venue has no obligation to mitigate damages by rebooking the date, or the cancellation penalty exceeds the venue actual anticipated losses. Courts in many states have found liquidated damages clauses in event contracts unenforceable when they amount to a penalty rather than a reasonable estimate of actual damages.
Check your contract for a force majeure or impossibility clause. If the cancellation was due to circumstances beyond your control, you may have grounds to void the cancellation penalty entirely. Even without such a clause, the common law doctrine of impracticability might apply depending on your jurisdiction.
Also review whether the venue fulfilled all of its pre-event obligations. I have seen multiple cases where the venue breached first by failing to provide agreed-upon services like tastings, walkthroughs, or vendor coordination by contract deadlines. If they did, you can argue their breach excused your performance including paying cancellation fees.
At 110K you should absolutely consult with a contract attorney. Many will do a contingency arrangement for disputes this size. Also check whether your homeowner or renter insurance, or any event insurance you purchased, covers cancellation costs. People frequently overlook this.