Adding guests to ADR?

I have reservations for 6 at coral reef 2/3 around dinner time and the same reservation for 1900 park fare on 2/4. Since I made the reservations however, my in laws decided to join us on those days. I’m wondering if I can call and add 2 guests to my ADRs or if I have to rebook a table for 8. When I looked for a table for 8 at coral reef, it tells me there are none available at all during dinner hours. Should I call?

You can always try to call - nothing ventured, nothing gained. Also, if the CM can’t help you, call back and talk to another CM - some are more “magical” than others.