ANSWER: 

This is totally prohibited. Its not permissible to have friendship between girls and boys in Islam.
You must not be part of such mixed gatherings. 

Kindly refer to the following link(s):

Ya Sheikh my Question is it is Haram to Join in beach outing together with you friends Boys and Girls?or a Reunion with my Friends?

Halal/Haram Matters | January 9, 2018 3:38 pm
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My sister and I study together with our Sir who is 1-2 yrs elder than my sister. Qstn is that My Papers r going to be started so i will not study from my sir but my sstr will study with sir alone in room, am i will be sinful for because i am not studying with sstr.if yeswhat sould i do???
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Sheikh if one Muslim calls another Muslim kaafir than what would happen.