Hardware meetups and exhibitions such as various maker fairs, conferences or camps are great fun and a great way of harvesting motivation and energy for continuing your projects, but they can also turn into a logistic nightmare. Below are some ideas I have about how you can design your projects to make them more exhibition-friendly, and to reduce your stress.

Power

Most electronic projects need to be powered to work. For exhibitions it's best if you can just power them from USB all the time. Even if they are portable devices with a battery, it's much easier to just have them lie on the table with that USB plug connected, than to have to worry about recharging the battery. Using a standard connector and voltage, like USB, makes it also easier to swap them, or to find emergency replacements for your power source if anything goes wrong.

If you are going to a different country, it's a good idea to check what plugs are in use there, and what voltage, and to take the USB power adapters appropriate for that. It's usually also a good idea to bring a power strip with you, to connect all those power adapters, and perhaps also some beefy power bank, so that you can even go independent of the power for a while.

If the device really needs to rely on battery power (for example because it's a robot that moves around untethered), make sure the battery is removable and easily accessible, and bring spare batteries and external charger (even if the device has a built-in charger). This way you can recharge one battery while the device runs on the other.

Size

Desktop-sized projects are the most convenient for exhibitions, because you can travel with them easily, and they easily fit on the table. If your project needs to be larger, it's good to make it modular, so that you can disassemble it into easy to transport parts. Also, if there are any fragile parts, or parts that stick out, it may be a good idea to make them detachable, so that you can transport them separately in a way that is safer for them.

Another advantage of smaller projects is that you can bring several copies of the same thing (or different versions), so that you have a backup if one of them breaks. However, in my experience, bringing more than two for a two-day event is not necessary.

On the other hand, things that are too small, and don't move or emit light, are very easily to miss and will not work well to attract spectators. It's good to have at least one large or blinking project, to get people to come to the booth, and then more smaller projects that they can see once they get there.

Parts

Avoid parts that cannot be replaced. Avoid designs that require you to disassemble the device completely just to access a single part. Ideally use off-the-shelf parts without modifications, have them attached by standardized screws, and connected with sockets and plugs. You can solder or glue things together as long as they constitute a single logical part, that you will always replace as a whole, otherwise avoid permanent assemblies.

Bring a screwdriver that matches the screws you are using, and any other tools required to replace the parts of your device. If certain parts tend to break more often (servos, fuses, light bulbs), bring spares.

Descriptions

I highly recommend preparing and printing descriptions of your various projects, either on A4 sheets of paper, or on business card sized cards (if you choose the latter, bring two-sided tape to tape them to the table, otherwise people will take them). This saves you some talking, and lets the more shy spectators to also understand what your projects are about. Include links to more information, possibly also QR codes (but a URL in a text form survives on photos better).

Interactions

It's always nice when the spectators can interact with your projects, but try keep it simple. Press a (large) button, wave a hand, touch something. Very few people will have time for any more complex interactions, such as playing video games, composing a piece of music or drawing something, especially if it requires concentration. And explaining to everyone how to play a given game gets tiring very fast. If an interaction takes more time than a few moments, you might have a problem with people queuing up for it, and then getting bored and leaving, unless it's also interesting to watch.

Health

Never go alone. You will not even have time to go to the toilet – join with some friends and man the booth together, so you can stand in for each other, and if someone has more advanced questions, tell them to come later when the other person is present. Make sure to always have something to drink. Even if you drink and speak quietly, you will get a sore throat after a whole day, so it's good to have some kind of syrup of pastilles for that. Take breaks and make sure to eat properly. Sit down whenever you can.