This (primarily static) site is structured as follows: Each individual page has its own html file, and each of the year pages also have their own corresponding html file.
To create a new page for a year (say, 2019), just create a new file called <year>.html and copy and paste the code from any of the previous year pages. Add in the relevant text in the appropriate section(s) - Commencement or End of Year. Then, make sure you add the link to the years.html file (so that it is shown in the grid of links), and then re-deploy the website.
This website is hosted using Amazon S3, which is best for static website hosting. For any questions about deployment, take a look at this tutorial, focusing on the part about uploading the files (the other stuff should already be set up). For any questions about the code, reach out to tanvir_shahriar@brown.edu; for any questions about the deployment process or AWS, reach out to rahul_jayaraman@alumni.brown.edu (or rjayaram@mit.edu).