What to use for building website with a lot of user input

I have built a couple of websites using Bootstrap and PHP. Running my own webshop using this and is good enough for me. This is very time consuming because everything needs to be coded by hand. I have received a request to create a website for registration of events. People need to be able to register with these events and the staff needs to be able to record and save what people consume. So it needs a lot of user input. Now if i would use the Bootstrap PHP way this will take a long time. What is an easier and better way of creating this kind of website? Looking into Node.js but im interested in what other ways are out there.

Thanks in advance!