You can limit the number of submissions a form can receive in your form’s Security section within the form builder. Tick the option Limit the total number of submissions. Afterward, specify the maximum number of submissions that you want to accept for that form. You can choose to accept a certain number of submissions per hour, day, week, month, year, or eternity.
If you have an event with limited seats, you can limit the maximum number of guests permitted to your event, through your online form.