Worried about people reusing a name badge to get into an event? With temporary badges, the name badges you hand out will go void within 24 hours. If that person wants entry again, they'll need a new badge. Once the badge is used, a "Void" icon will slowly grow visible, so everyone knows whether the badge has expired or not. The badge book also copies the information written on each badge, so no sneaky people are allowed to change the date and blame the badge for expiring too soon.