Almondjoy1

I’ve tried searching and I’m not finding the answers!

Our dining reservations open tomorrow. Is there a set time they open, as with excursions? (I know I saw it on some paperwork, but now I can’t find it). 

We are traveling with friends, in the same cabin class, and I will be making the reservations for the group. I know I need to invite them in MJV, and I have room and booking numbers. Once I invite them, do they need to do anything to accept?  
 

Thanks!

We just got off the Mars and played trivia on each sea day. No trivia on port days.