Be prepared for noise, spills, broken items, and tiffs. Although a teen party should always be chaperoned, avoid hovering. Try to let your teen have fun without worrying about being embarrassed.  Let your teen come to you if there's a problem. Tell him/her in advance that you're giving them the responsibility of alerting you if anything goes wrong. There is always a possibility that alcohol or drugs will show up at the party. If you trust your teen and know that they hang out with respectable and responsible teenagers, this probably won’t be an issue. If it does happen, however, you shouldn't necessarily take this as a poor reflection on your kid’s character. Keep an eye on things and if you do see drugs or alcohol that you do not approve of, stay calm and politely ask those responsible to leave. If the teen resists, call the teen's parents or, if you are too worried, call the police as well as the folks just in case things might get out of hand even more than they did when you first approached them. You love your children, and seeing them interact and have fun with their friends might cause you to be sentimental. But obvious signs of affection – hugging, kissing, pet names, etc. – are the death knell to a teen's sense of independence. Keep it low-key. If you're planning on inviting a mime to come and do an impromptu performance, then reconsider: kids usually have very rigid ideas of how they want their party to unfold. On top of that, they usually don't consider adult "surprises" to be all that exciting. This is the price of having an awesome party. Make the activity fun for them, if possible, by:  Offering to let them keep the cash collected by recycling any cans or cartons associated with the party. If it's a big party, they can clean up in more than one way! Keep the music going, a movie in the background, or a few select friends around to help with the clean up. Six hands is always better than two. Tell your kid that if they handle themselves in a mature way, you'd be more than happy to let them throw...

TL;DR in Indonesian:
Tetaplah tenang selama pesta berlangsung. Hindari menunjukkan rasa sayang yang terlalu berlebihan selama pesta berlangsung. Hindari memberi kejutan yang tidak siap anak Anda terima. Biarkan anak remaja Anda membersihkan sisa pesta. Beri anak Anda imbalan karena sudah bersikap baik.