What to bring to concerts, theme parks and days out, where the rules on what you can carry in are half the problem.
Days out have a particular failure mode: you pack well and then discover at the gate that half of it is not allowed inside. Bag size limits, bans on outside food and drink, and rules about cameras vary by venue and change between seasons, and finding out at the door is an expensive way to learn. These checklists are built around that. They cover what to bring to concerts, theme parks and similar days out, and they flag the items most likely to be restricted so you can check before you leave rather than at the bag search. For long days on your feet, they also cover the things people consistently under-pack — portable chargers, blister bandages, a layer for after dark. Quantities scale with your group size, and sharing the list means the person carrying the bag is not the only one who knows what is in it.
Getting ready for a concert where bag rules are strict
Packing for a full day at a theme park with children
Working out what is worth carrying for a long day on your feet
Splitting what to bring across a group going together
They flag the items that are commonly restricted — large bags, professional cameras, outside food and drink — so you know what to check. Rules differ by venue and change over time, so the lists point you at checking the venue's own page rather than stating a rule that may not apply where you are going.
Quantities adjust when you set the number of children, and items that only matter with children in tow are marked accordingly. The difference between a theme park day with and without children is mostly in the volume of snacks, spare clothing and rest planning rather than in entirely different items.
A portable charger and something for blisters, consistently. Phones drain faster than expected when used for photos and tickets all day, and a full day of walking in shoes that are fine for normal use is a different thing entirely. Both are on the lists for that reason.