Is there a way to limit the amount of rows allows in a sheet?

I have a convention with 35 districts and each district is restricted to a certain amount of hotel rooms. I am planning on creating individual sheets for each district. For example, Atlantic District can only have 20 rooms. Is there a way after 20 people sign up, no one else can sign up? Can I have automation after 20 entries no other entries can be made. Sometimes it might be one admin within the district filling out the sheet for all the participants and I don't want her to be able to go beyond the allotted amount of rooms.

Your help is greatly appreciated.


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