Need new ideas and plans for conducting technical events in college.

Hello crazy engineers,
I need some new innovative ideas in order to conduct some interesting events in my college like in tech fests. In tech fests events are usually on large scale but here I need to figure out some ways of learning something with entertainment.
For example we are carrying out a technical quiz contest and workshop but apart from them we are short of ideas.
So if any of you have a good idea like crack the code quiz, Please feel free to share. 😀
PS- We need ideas related to computer science only.
- Crazy computer science engineer