BakerStreet-2020 | Website for event - 221B Baker Street

First of all you will need a database of your own which should be created in MongoDB Atlas, we created cloud-database so that handling of data can be done in JSON format and for higher secuirity.
Considering you have PHP environment set (XAMPP in my case) and composer installed.
Generate your MongoDB encoded URL for connecting your site to Atlas.
Clone the repo
Run follwing command for initializing, this will create composer.json, composer.lock files.
Install MongoDB PHP driver
Setup MongoDB PHP Driver by referring - https://docs.mongodb.com/drivers/php
Add this to your php.ini file and start your Apache server:
Create a file named 'secret_key.php' in Database folder and write this code:
In PHPMailer/index.php do the following changes mentioned in comments.
Till here your website is ready for localhost, now lets move on hosting: I have used Heroku platform for hosting, just create an account and an app with PHP environment. We are basically hosting our github repo on Heroku with automated deployment ie. whenever I commit changes in my repo, it will automatically affect changes on my website. Refer: https://youtu.be/zavb4WG8x-8
You are ready to go!!!