Finding your iPhone in a room with 30 other iPhones that look the same and are on the same ringtone in under 3 minutes is simple:
If you have an Apple Watch, ping it. You will find it in less than 10 seconds.
If you don’t have an Apple Watch, use one of the other phones in the room to call it. Make sure you know whose phone you are using to call it, then look on the other phones for the name of the person calling on your phone as it is ringing.