When you don't tweet about it, people forget and fewer people turn up! AlertCal automatically does this for you, so you don't have to worry about it
Configure times of day to remind followers and customize for your needs, 2 days leading up, then 4 hours before and thank everyone afterwards.
Customize the text of your reminders so your followers know it's really you
Track how many people signup for your event, so you can tailor messages, times and frequency for your own use