SMS reminders are more effective than email reminders for events because they have significantly higher open rates, often reaching over 90%. This means that event participants are more likely to see and respond to SMS reminders compared to email, which can end up in spam folders or remain unopened. Additionally, SMS messages are delivered instantly and are more likely to be read quickly, making them ideal for sending last-minute event details, changes, or confirmations. This immediacy and reliability make SMS reminders an effective tool for increasing event attendance and reducing no-shows.