We are only 13 days away now and I need to give our venue the final headcount next week. A lot of my mom's family members just aren't accustom to traditional weddings and proper wedding etiquette. I just heard today that one of my aunt's (who RSVPed yes for 3 people in her family) is not coming anymore. She didn't call me herself, I heard from my mom. We are spending over $90 a person at our venue and I really wish that people who aren't planning on coming would give us a courtesy call. Is it acceptable to call all of these people who may or may not show up (but have RSVPed yes) to find out if they are for sure coming before we write that final check?? If so, how do I say it without sounding like a jerk?? Thank you for your help!