Oh no deary, you're perfectly fine! I love getting ideas from everyone 
and these are great ideas!
Oh good, that's a relief! ^^
A few more things came to mind and they're probably five of the most key issues that people worry/complain about.
1.)
Hygiene. It's really hot and stuffy inside the hotel so it's very easy to get sweaty and smelly. It would be great to mention that
everyone should bring their hygiene products to their hotel room (body spray, deoderant, soap, shampoos, etc.) to stave off the stench. Also, I recommend that everyone brings a second costume (if they want to bring more than two, that's their choice) in case a costume gets especially sweaty; if it gets wet, swap it out for something that's clean, dry and fresh as a daisy. Cleanliness just makes the con atmosphere and experiance more comfortable for everyone; and I'd like to think that it keeps everyone's spirits up too.
2.)
Packing. Packing is one of the stressers that a lot of cosplayers experiance. They just got finished with their costume and props and the con is just a few days away so...when and what do they pack? It would be helpful to mention that cosplayers should only bring what they need personally and what they'll need for their costumes. Nothing more. (costumes/props, hygiene products and meds, food, change of street clothes for the trip home, etc.) Personally, I recommend that everyone should make a packing list of the essentials and check it off as they pack; and I do recommend that they pack at least a day or two in advance.
3.)
Food. Food is a relatively big concern at conventions. People are hungry and tired and they don't have a whole lot of money to buy food to survive. I recommend that con-goers could look up the local foodcarts and restaurants within walking distance of con space and plan ahead. Another good idea, and probably the most cost effective, is to bring their own food to the con. Most hotels in the area have a mini fridge (some even have coffee makers or microwaves - which are good ways to boil soups or ramen or other foods) that people can use to their advantage. This is also good to keep in mind if people have food allergies or worry about getting food poisoning - just bring the food you know you love and trust. (And, it shouldn't just be junk food like ramen and pocky; bring something like sandwiches or bagels!)
4.)
Staying cool in the heat. It's very easy to get dehydrated or heatstroke; so it's always important to stay cool during the summer. I personally recommend that people should do as little walking around in the sun as possible, take plenty of sitting breaks, have bottled water and a folding fan at all times when you're outside your hotel room. (And I do suggest keeping lots of bottled water - or buy jugs of it at the store - and store it in the mini fridge in the hotel) Also, if things get too overwhelming and you're hot/tired and have sore, swollen feet, you can go back to your room and drink some cool water while dipping your feet in cool water in the bath tub (this was a lifesaver!); do this for about a half hour and you'll feel regenerated.
5.)
Planning. One of the most fun and exciting things to do before the next convention starts up is to think of what to do for the following year. It would be a good idea to do some early research and planning by checking the forum and the website news for what's going on. Maybe next year someone wants to take part in a panel, or in the cosplay contest, or pick which games they'd like to play; or which voice actors they'd like to meet, etc. It's just a good strategy to get an idea of what one would like to do. My motto is 'make a plan, but go open-minded'; this means that you might want to have a plan in mind so that you'll have fun things to do at the con, but keep your ears open for new things that pop up that also might interest you. And, buying the badge, booking the hotel and picking out a cosplay also fits under this category; and I recommend that those plans be set in motion as soon as pre-registration opens!
I guess this fits within safety and planning.
