graduation help

Okay so him and his family made us shirts and stuff for graduation but me and my friend are afraid to show up too casual. So what I'm asking is that is the graduation dressy or casual or even semi formal or just nice clothes. 
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The other thing is that going to want to have so much sex while he's here and I wasn't able to go on birth control in time so condom recommendations ?
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Lastly where is it the best place to have sex  where you for sure won't get caught ? Our parents are always home and my car doesn't have tinted windows. 
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Thank you !!!

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