Like your new feature of limiting the total amount of responses to a whole form. However - when registering for specific sessions at an Open Day, it would be great if one could limit the amount of responses to specific questions, so we have a cut-off for 500 people attending a talk on Student Fees, or 300 on a talk about Student Accommodation.
Hello, I think this would be a good suggestion for our User Voice forum. http://formassembly.uservoice.com/forums/12295-formassembly-com
For a solution, if they have to choose between the two, I would copy the form and have one for 500 people attending a talk on Student Fees and the other for 300 on a talk about Student Accommodation. If they can sign up for both, you can have the general information passed from the first from to the second if they choose to sign up for both. That would just be a convenience for them.
To redirect your visitor based on a field value, see our documentation on Dynamic Configuration with Formulas. http://www3.formassembly.com/blog/support-documentation/managing-your-forms/using-formulas/#dynamicthankyou