Scalability for 40+ concurrent users

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We are creating a basic app to support and quarterly theme game within our company. It is likely we could have 40 concurrent users once or twice a week. The app is fairly basic reading data from CSV that allows a few user inputs and write those inputs to CSV/Database for tracking. Dashboard might be 200 to 300 lines of code and I think we are going to avoid using external scripts just creating a few functions within the dashboard. Anything else we should think about in regards to scalablity with that number of users. Not that 40 users is a lot in regards to normal website but it is not clear if PSU architecture will support this? We are trying to use session and cache scope variables where appropriate.