Should I tell a client someone else wants their date?

Yes, factually and without drama, because it's true and it's the fairest thing you can do for them. It also closes deposits faster than any discount ever will. Just never invent a phantom rival, because in a small local market, invented urgency eventually gets found out.

What if the second client offers to pay more for the date?

The date isn't for auction while a stated hold is live. "First deposit takes it" is the answer, and if their bigger event genuinely needs custom scope, quote that on an open date. Integrity on one Saturday is cheap advertising for years.

What if a client's deposit fails right as the hold expires?

A failed payment attempt in good faith earns a short grace, a few hours to fix a card, communicated to both sides. Silence past the deadline earns nothing, and the date reopens.

How do I avoid this getting messy with phone, text, and form inquiries at once?

One list. Every inquiry, whatever channel it arrived on, goes into the same pipeline with its date and hold status the moment it lands. The mess is never the two clients, it's the operator finding out about one of them late.

What to do when two clients want the same date

The deposit decides. First deposit in gets the date, everyone gets told that rule up front, and nobody can be mad at a rule that was stated before it applied. Two clients wanting one Saturday isn't a conflict, it's the deposit policy's whole reason for existing, arriving on schedule.

The script, word for word

Client A asked first but hasn't paid. Client B is ready now.

To Client A, the moment B appears: "Quick heads-up, someone else just asked about your date. You're first in line until tomorrow at noon. The deposit link is in your email, and once it's paid the date is locked for you."

To Client B, same minute: "That date has a pending hold until tomorrow at noon. If it opens up you're first in line, and nearby date is wide open right now if you'd rather lock something in today."

Both clients got the truth, a deadline, and a path. Whoever pays first wins, and you sold urgency to two people without inventing anything.

The rules that make it clean

A hold has a clock or it isn't a hold. 48 to 72 hours, stated out loud and written in the follow-up. An open-ended "we're thinking about it" is not a claim on your busiest Saturday.
The clock is public to the holder. Client A should always know their hold expires, from the moment it starts, not just when a rival shows up.
Money beats memory. "But I called first" is real to the client and unenforceable to the calendar. The deposit is the only tiebreaker that never needs a judgment call.
Never run a quiet auction. Telling B what A is paying, or inviting either to outbid, wins one weekend and poisons your reputation in a business that runs on local word of mouth.

When both can actually be yes

Before turning anyone away, check whether the day fits both: one morning slot, one afternoon slot, honest buffer between them. Two deposits on one Saturday is the best version of this problem. If it takes a second crew or rig you don't have, that's not this weekend's solution, but write it down, because turning away paid demand monthly is the signal it's time to grow.

The line to remember

You never have to choose between clients. You built a rule that chooses, told everyone the rule, and let the deposit do the awkward part.