Map the event as the cat experiences it
A wedding is not one absence; to your cat it is a rehearsal evening, a morning of strangers and hairdryers, a long empty afternoon, and possibly a houseful of guests afterwards. List every block where the house will be noisy, empty, or full of doors opening, and plan cover for each block rather than just the ceremony hours. If guests will be in the house, decide now which room becomes her closed sanctuary, with tray, water, food and bedding moved in the day before, so she is not being relocated through a crowd of wedding outfits at the worst possible moment.
Choose cover that survives the celebration
The house-sitter who is also a wedding guest is the classic failure: they leave when you leave and return when you do, so the cat gets a rushed feed at best. Book a sitter who is not attending, or a trusted neighbour outside the guest list, and give them exact visit times that bracket the event, including a late-evening check if the party runs on. For a multi-day celebration away from home, treat it like any trip and book boarding or a live-in sitter early, because wedding dates collide with peak boarding demand in a way that surprises couples every season.
Protect her from the party itself
If any part of the event happens at home, the risks are specific: doors and gates held open, rich food within reach, flowers and lilies in arrangements that are dangerous for cats to chew, alcohol glasses at cat height, and well-meaning guests hunting for the cat to say hello. Keep her sanctuary room locked or clearly signed as closed, brief one named person to check its door stays shut, and move all arrangements and leftovers out of her territory. A cat who dislikes strangers will have a better wedding day asleep in a quiet room than as an attraction in a crowded one.
Write the plan down and name the people
Event days dissolve good intentions, so the feeding times, sanctuary arrangements, sitter visits and emergency contacts need to exist on paper and in the right phones before the week begins. Include your vet's number, where her carrier lives, and who has a spare key, and tell your sitter which behaviours are normal for her under stress, such as hiding and skipping one meal, versus what should trigger a call. Confirm every booking a few days before, in writing, because a misunderstood date discovered on the wedding morning cannot be fixed at any price or with any amount of panic.
Assign it like a rota, not a favour
Splitting the weekend between a neighbour for Friday, a sitter for Saturday and family on Sunday works only if each person knows exactly which duties are theirs and can see what has already been done. Photograph the sanctuary room setup on your phone before the event, so anyone can restore it exactly if supplies get moved mid-party. Laying the whole event out in KinsLe Care Teams lets you assign each feed, sanctuary check and litter visit to a named helper, with completions marked and timestamped as the celebrations roll on.