This has been an ongoing battle for me for the past 10 years and it only gets worse as your children get older.
I just had a party for DD15 this past Friday, not one parent called to tell me their son or daughter was coming but 22 kids showed up. All the kids just told DD if they were coming and I kept quizzing her on a daily basis for a head count.
The other thing that get's my goat is the amount of parent's who don't even get out of the car to meet me, they just drop their kids off and leave. For all they know, I could be Jack the Ripper....it just amazes me. It's funny the parent's I know because they're DD BFF's they came in but the ones I didn't know just dropped off and left. I can't fathom dropping DD off at someone's house I don't know and not going in to meet the parent's.
I told DD I would throw her a big old Sweet 16 party (rent a hall, get a DJ, etc.) and then I'm done with the birthday parties.
To be perfectly honest, at 15, you shouldn't be expecting the parents to call. Many teenagers of 15 hold part time jobs, etc. They should be responsible enough to be able to RSVP to a party on their own.
Last year was the last "party" for our kids. For DD's 13th birthday, we invited about 8 girls for a sleigh ride and sleep over. Everybody said they were coming, including one girl who is Muslim. That meant that I had to put some thought into the foods that I would serve because of dietary restrictions and some of the activities. The party was at the first of December and I had purchased some craft supplies for the girls to make some Christmas crafts, tree ornaments, etc if they wanted to. I made sure to get generic seasonal crafts like snowflakes, candy canes, foam door knob hangers, stuff like that. I didn't want to make our guest uncomfortable with more overt religious decorations like stars and angels. Anyway, despite having RSVP'd and confirmed her attendance the day before, the girl never showed. I was royally pissed off because I had gone to quite a bit of effort to make sure she wouldn't feel uncomfortable.
One other girl didn't show up, either. When my daughter called to see where she was, she hadn't even told her mother about the party, and had planned all along to just blow it off. Her mother was furious! She grounded her, and when we came home from the sleigh ride there was a gift waiting on the porch with a nice letters of apology, one for my daughter and one for me, apologizing for the trouble and expense that I may have gone to. In turn, I had my daughter call the girl and thank her for the note and the lovely gift.
Anyway, my daughter's birthday is Thursday. Friday is a day off school, so one friend is sleeping over, and another (who has a tournament to go to on Friday) will come to spend the evening. She will get to celebrate with cake and her two best friends on her actual birthday, so that will just have to be good enough. I'd rather spend the money on a nicer gift than a party that will cause everybody stress.