I've used Gravol Ginger chews when I've felt queasy (looking at you, Time Warp @ Canada's Wonderland). That might be something to explore.
My Time Dining might be difficult if the entire wedding group is dining together.
As for the third dining time, it's a good idea for the guests, but bad for the restaurant and kitchen crew. Two covers/night means that you have some time to get things set up and gives the kitchen some leeway if they're having a day.
Three covers/night means the turnaround time is a bit more rushed, service might be a little more sloppy and if the kitchen gets behind, it could have greater impact for the diners.