Unfortunately I haven't tested it at special events like weddings as I've never played that part of game. You may find it works well or not so well in your environment. However it's not a one-size-fits-all solution (I do wish I knew one), and its effectiveness may vary depending on situations and other mods installed that introduce new autonomous actions. This mod was created based on my usual playstyle and environment and it helped my Sims remain seated for the longest possible time without problems. Steady Sit state will end as soon as Sims' bottom leave the seat. But it's not overly forceful and Sims can still get up for various reasons, such as low motives, player direct interactions that require standing, or any higher-priority autonomous interactions that hasn't been restricted. Theoretically, Sims will stay seated for up to 240 Sim minutes. (You can also simply initiate any interaction from pie menu like 'Go Here''Call Over'.)

' Leave Seat' option for all Sims in the Steady Sitting state, allowing them to immediately end sitting and stand up.

All diners (of that moment) who sit or are already sitting will enter Steady Sit state. Sims with claimed tables will return to their seats and continue their dining process, while unassigned sims will sit at random seats in non-dining areas. This lets you instruct all diners to sit. ' Seat All Diners' option to the floor in restaurants.Each picked Sim will enter Steady Sit state.

' Seat Sims Here' option for chairs (and pool edges), allowing you to select one or multiple Sims and have them sit on the clicked or nearby chairs.

They are still able to initiate interactions that they can do while sitting. This will help Sims stay put in their seats longer instead of hastily standing up or frequently changing seats. It allows Sims to sit down while restricting most of the common autonomous interactions that might prompt them to stand up.

' Steady Sit' option for chairs (and pool edges).

This mod adds the following new interaction options: That's why I made this mod as an attempt to alleviate the issue and provide a relatively more 'steady' sitting experience. I've been bothered by how Sims would hastily get up from chairs as soon as I told them to sit. Some friends said they urgently needed this, so I reconstructe d it and h ere it is. This was a mod I created before for private use.

Sims 4 functional stroller mod