Do you mean individually in the same calendar, rather than creating different colored calendars you can add events too? Most calendar apps can do the second. I don't know of one that will do the first.
The Calendar app on the iPad can have up to seven different colored calendars, if you don't count the gray Birthday calendar that can be added from the Contacts app.
Good luck with your question (looks as if you are off to a good start with twerppoet's help).
I deleted the six (!) other threads you started today on this same topic. Making more than one post not only fragments the conversation and makes it hard to follow - it's against the forum rules. Please keep any follow-ups, discussion or updates on this topic to this thread; do not start any more. Thanks for your understanding.
The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.