We've done 50-50 for years now. Mon-Tues with one parent and Weds-Thurs with the other, then alternating Fri-Sat-Sun each week. Handovers are at school, so if it was your weekend you drop off on Monday morning and the other picks up. DC attends activities after school with each parent too, so it's always consistent. We also use the end of the school day as a standard pick up/drop off if a child was sick and off school on handover day or there was an inset day or something.
Any weekend activities are respected, so if there's a cub camp and they go to cubs on Mum's day, but it's Dad's weekend, they go to cub camp and dad drops off/picks up. We usually swap weekends for family events/parties but if it's not possible then DC goes to the event with Mum/Dad and goes back to their other parent after the event. Sports is also the same and if we can't swap then they attend the event with the parent they attend the sport with. If there was a clash, and DC would enjoy both things, whoever's weekend it is supposed to be decides which they go to.
We also exchange a basic email that covers a few details about their time with the other parent, just a few things about stuff like trying new foods, any issues at school (Serious issues are raised the same day) if they've watched a film they loved or haven't been feeling very well, if they've been sleeping badly, or went up a level at swimming etc. We use a template each week, it helps everyone stay up to date with this evolving little persons life.
Christmas is fully alternated, one year Christmas Eve/Day with one parent and Boxing Day with the other. This was SO tough the first time we did it but it's better for DC, because then they get to be fully immersed with that extended family, traditions, cousins etc and they don't miss out on anything. We found that when they were little whoever had the afternoon portion of the day had a tired, overwhelmed child who didn't know what to do with themselves and didn't want to leave one set of cousins to go to the other set of cousins so even though both of us got to spend time with DC on Christmas Day, It wasn't an amazing experience for anyone involved, and it sort of felt like we were putting our own desire to be with them on Christmas Day above their experience. Also, although things are reasonable, communication about DC is open, I prefer not seeing the ex on Christmas Day, we're all settled with new partners and it's just nice to get that whole day, uninterrupted. The rest of the holidays are also split 50%, by nights, if there's an odd number of nights then whoever wasn't with them on Christmas gets the extra night.
The rest of the holidays are split down the middle, normal pattern in half terms and a week each at easter, and the summer is done in 2-1-1-2 weeks, not days, so each has an opportunity to take DC away on holiday for a longer period of time if we want too, they just inform the other where they're going but don't have to try plan dates and ask for time from the other parent. Generally, the same parent has the first two and the same parent has the last two, but we check before we book!
DC has a bedroom in each home, own toys/games/books and we each have a full wardrobe of shoes and clothes, uniform etc, so nothing has to be brought or exchanged between each home. We also tend to do separate types of toy when possible, so for example Dad buys LOL dolls and Mum buys Hatchimals, this is very much enjoyed by the child because they get to have it all
If anything is ever forgotten we just exchange before school. Parents evenings are attended together, so there's no confusion about what was said, or how anyone feels about it.
DC considers both homes to be 'home' and doesn't ever show a preference to either, the only upset we ever get it sometimes before school on handover day because they sometimes express sadness that they won't see mum/dad but are excited to see dad/mum, but that is part of life with separated parents really, and whenever asked they always say they'd never choose to see mum/dad less in order to stay with dad/mum more. We're quite structured in how we do things generally but will swap when asked and it's possible.
It's great because there was once a time of extremely high conflict, no communication and now there's a set precedent, and we all know the score in most situations, everyone generally knows where we stand, we have kind of unwritten rules that mean everyone knows how we do things and it means there's now very little to have any conflict about, because we can consult the 'rules'. We do actually have a court order, but it's much more vague than what is set out here, outside of the routine at the top, the rest is what we worked out ourselves after we each attended the separated parents information course, and over time.
We're also very aware that a time will come when we won't have so much structure, but we're both prepared to follow the lead of our child and let them decide what we do (Within reason obviously!)
I know this is a lot of information written down, but hopefully it helps someone out, navigating a split and contact after that is difficult, and I found other people's experienced helped us a lot!