I've been to several concerts lately and I am surprised by the items people bring to the shows. I made a list of items that can be cumbersome and annoying if you were to take them to a concert. Some of the things listed are common sense, while others may not be so obvious.
It is not a good idea, ladies, to take a purse to a concert. Especially, if your at a show that involves tight crowds. Imagine being in a tight crowd and people are bumping up against you. How accurately would you really notice someone unzipping a pocket and taking your phone or wallet? It's also very annoying for the people around you to keep getting hit by your purse every time you jump or move around. Bring your cash, phone and your ID and keep them in your pockets. If you happen to leave the house in pants without pockets, ask a friend to hold them in his/her pocket. Most guys have pocket space to spare.
This is one of those 'no brainers'. Never go to a concert in flip flops. Even if you are going to a sit down show, it is always safer to wear full shoes. If there is an emergency, flip flops can be hazardous. You may find that you don't get a good parking spot and have to walk a long distance to the event. In this instance, they could be very uncomfortable. But the story that always pops into my head when people wear flip flops to a crowded show is about a girl, who was in the mosh pit of a heavy rock concert. She was wearing flip flops (of course) and ended up loosing her big toe. It's much better to go home with smelly, sweaty feet than a foot without a toe.
If you check the weather and know that the weather is going to be cold, than you could bring a sweater. But keep in mind you'll have to drag that sweater everywhere you go. Even at a place like Starlight, bringing a sweater could be frustrating. I suggest if you're going to bring a sweater, show up with it on. Don't forget, in crowded places it gets warm quickly. If you are inside, the venue will always be hotter than you expected.
I can not see a reason why you would bring food or drinks to a concert. Most places don't allow food and drinks into the concert area anyway. Some places allow a bottle of water which may be fine if you are sitting and watching a show. But it's just an extra item to carry. You could always tailgate before the show, just as long as you don't take anything in with you. Remember food and drink can be purchased at the concert event.
Some may find it easier to use a card instead of cash. While vendors don't normally take cards, there is almost always an ATM at concert events. Their usage rates can be quite high though. Who wants to stand in line to get cash so they can stand in line to buy a beer? By bringing cash, you are more likely to stay on a budget. Lastly, bringing a card and losing it, would mean more stress than bringing cash and losing that.
If you can wear contacts, do it! Glasses are a pain during a show. There is always some type of glare and if it gets hot, the nose gets raw. Sunglasses are another pointless item to bring. I can understand if the concert is in the middle of the day and the sun is out during the whole event. But countless times I've been to shows and see sunglasses broken on the ground. The stage will not be in the same direction of the sun so don't worry about sunglasses for shows that start around 6 or 7pm.
Not sure if I really need to explain this one. Occasionally people forget they have pocket knives in their pockets. Leave them at home or in the car.
Please keep in mind these are merely suggestions. I understand that some people have little choice and a need for these items. This is based on my own personal experience of going to concerts and seeing people struggle with the items they brought. There clearly are many other objects you shouldn't bring to concerts (i.e pets, high heels, beauty products, big jewelry, etc). This list is just an example of what I've seen lately.