Have in mind the idea that you should give a party? (9)
I believe the answer is:
entertain
This might be a double definition.
'have in mind the idea that you should' is the first definition.
'entertain' can be an answer for 'have' (I've seen this before). I'm unsure of the rest of the definition.
'give a party?' is the second definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for entertain that I've seen before include "Act as host" , "Train teen to amuse" , "Amuse or take into consideration" , "cheer" , "Have company" .)