How should I respond to questions asked before being allowed to enter the United States?

I want to travel to Florida for 3 days, just for a party. If CBP officers ask me the purpose of my visit, and how long I plan to stay, is it safe to tell them the truth, that I am traveling for an event, it's a 3-day stay, from Friday to Monday?
Reason why I asked because I spent 4 months in the us and will be returning after 5 months in my own country .
I just wanna know if I should say traveling for a party or traveling for an event.
Best Answer
To your comment that you want to know if you should mention your reason for travel a party or an event:
There is no harm in saying it's a party at a friend's place along with the address. The officer may or may not ask the details of a party which would go on for 3 days, that really depends on him. EDIT: This goes for a beach party too
People always travel for birthdays, bridal showers, etc. So using the word party is ok as long as you know where you would be staying for the 3 days and what the party is about.
The word event usually refers to things like a conference where you have an invitation letter and qualifications to attend it; or something similar. However, if it is an event like a concert, festival etc then can say that you're going to ABC event at XYZ place.
Just be truthful and explain it as you feel easy.
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