Comic Market
Updated: July 8, 2025

Beware of Heatstroke at Comiket. Drink, Rest and Cool Down

Heatstroke is a set of disorders that are caused by exposure to hot and humid environments. Fluid and electrolyte imbalances cause dizziness, nausea, and potentially even unconsciousness if severe enough. At Comiket we have had cases both inside and outside the halls, resulting in increased visits to the First Aid Rooms.

Japanese summers are very hot, possibly over 35 degrees Celcius (95+ Fahrenheit) and humid. Please remember to drink water, rest, and cool down to avoid heatstroke while you enjoy Comiket. If you feel sick, do not hesitate to ask for assistance from staff or people around you.

Over 90% of First Aid users have heatstroke symptoms

C104 First Aid users by SymptomsHeat stroke: 90%Others: 10%

First-timers and experienced participants similarly affected

C104 First Aid users by Comiket experienceFirst-time : 38 %2nd Comiket: 12 %3-5 times: 16 %6 -10 times: 10 %11-20 tines: 6 %>20 times: 10 %unknown: 9 %

Avoid Heatstroke by Drinking, Resting and Cooling Down!

To avoid heatstroke and hospital visits, please keep in mind the following, so everyone can enjoy the event safely.

Tips for Indoor Areas

Drink often, Take Salts and Electrolytes!

Drink water and take salt even if you don’t yet feel thirsty. Sports drinks, oral rehydration drinks, salt candies and tablets are effective. (But don’t take too much salt either!) Drinks with caffeine (such as coffee and tea) cause you to lose fluids faster, which can result in dehydration.

Move around often and Take Rests!

Sitting down for a long time can cause heat to accumulate in your body. We recommend standing up and moving around once an hour or so. When resting, please sit down away from the flow of people. Do not sit down or leave baggage near emergency exits or areas marked with red tape.

Clothing and Body Temperature Control

Even in air-conditioned areas, it feels hotter if the area is crowded. We recommend wearing layered clothing so you can adjust, and having a change of clothes ready.

Tips for Outdoor Areas

Prepare for Strng and Direct Sunlight

Apply sunscreen and take precautions against UV rays. To prepare for waiting long , sometimes hurs, in line outside, wear light-coloured, long-sleeved clothing made of quick-drying materials.

We also recommend bringing a hat with a wide brim, or a personal parasol to block sunlight. Please be aware that in crowded areas, Comiket staff may request you fold your parasol for safety reasons.

Utilize Cool Places

Take rests often under the shade or in air-conditioned rooms. But please do not trespass or loiter in neighbouring facilities or private property.

Carry Ways to Cool Yourself Down

Ice packs, frozen drinks, wet towels and portable electric fans can help you to cool yourself down. In particular, using them to cool your neck and armpits is effective.

Preparations before coming to Comiket

Things to bring along

Right before Comiket

Early Symptoms of Heatstroke

Be Aware of These Symptoms!

If you Notice any of the Symptoms…

First Aid Room at Comiket

The First Aid Room is not a medical facility, and only offers basic first aid. If your symptoms do not improve, we recommend that you go back to your hotel early, or visit a hospital.

First Aid Rooms during C106

Locations
East 4 Hall Organizer’s Office, Conference Tower 1F, South 1 Hall 2F
Time
08:00 to 18:00 (until 16:00 on Day 2)

Drink Often (every 30min to 1 hour)

Drink enough water beforehand and prepare for the heat. Whilst waiting in line, drink additional small amounts regularly. Definitely do not try to reduce bathroom visits by avoiding drinking water.

If you do not feel well, ask nearby people or staff for help as soon as possible!

If symptoms are left too late, they may become life-threatening. Please stay cautious even after entering the venue. Also, if you feel tired please consider leaving the venue before exhaustion makes it hard to move elsewhere.

For Cosplay Participants

When cosplaying outdoors, you need to be extra cautious if your costume makes it hard for heat to escape. Especially wearing full-body suits like kigurumi (cosplay pajamas) or skin-tight leather suits can be dangerous because they tend to trap heat. Please consider the weather and your physical condition, and if you deem it dangerous avoid wearing such outfits.

Information on wearing a mask

Wearing a mask is a personal decision. However, in a designated areas like First Aid Rooms, you might be asked to wear one. We appreciate your cooperation. Also, since it becomes harder to notice thirst while wearing a mask, please be sure to stay hydrated.

Precautions while moving between Halls

There is a route from the South-West Halls to the East Halls that requires walking outdoors. Due to construction in East Halls 1-3, the distance on this route is significantly longer than usual. Please take precautions against heatstroke, such as staying hydrated.

Prepare for the Heat Ahead of Time!

Start getting your body used to the heat at least two weeks in advance — no later than 4 to 5 days before the event

It’s important to help your body adjust to the heat so it can regulate your temperature and sweat efficiently. The heat adjustment period varies from person to person, but it usually takes anywhere from several days to two weeks.
Start activities to help your body acclimate to the heat well before the weather gets hot. In daily life, activities like exercising or bathing that make you sweat are considered to be effective.
For example, walking, jogging, cycling, strength training, stretching and bathing. There is no need to overdo it - start with small, deliberate steps.

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[Since: July 8, 2025] [Last update: July 8, 2025]