Using bulk SMS marketing can be an effective way to send out event reminders and increase attendance for charity events. Here are some tips to help you get started:

1. Build a targeted list: Create a list of phone numbers belonging to individuals who have shown interest in attending your charity event. Segment your audience based on their engagement with your charity and past event attendance.
2. Personalize your messages: Use a personalized tone and language that resonates with your audience. Address them by name and thank them for their past attendance or interest in your charity.
3. Provide details: Provide details of the event, such as the date, time, location, and any important information attendees need to know. Make sure to highlight the value of attending the event and what they can expect.
4. Use clear and concise messaging: Keep your messages short and to the point. Use language that is easy to understand and avoid jargon or technical terms.
5. Include a call to action: Encourage your audience to take action by including a clear call to action, such as “RSVP now” or “Register for the event today.”
6. Provide value proposition: Give your audience a reason to attend. Highlight the benefits of attending the event, such as networking opportunities, exclusive content, or the chance to make a difference.
7. Timing is key: Send your messages at a time when your audience is most likely to be receptive. Send reminders closer to the event date to keep the event top of mind.
8. Use a reliable SMS service provider: Choose a reliable SMS service provider to ensure that your messages are delivered promptly and efficiently.
   By following these tips, you can use bulk SMS marketing to send out event reminders and increase attendance for charity events. Remember to show your appreciation to your attendees and keep them informed about the impact of their support.