Timestamp was built for you.
Timestamp allows you to setup meetings and appointments with anyone as long as you have their mobile number. The appointments are saved to your mobile calendar and the mobile calendars of everyone invited once they accept the invitation.
1. The sender can invite multiple people to a meeting or appointment
2. Timestamp synchronizes with the calendar application so invitees get the exact location
3. Invitees with Timestamp get notifications
4. Invitees can accept or reject the invitation
5. The sender and invitees can independently set multiple meeting reminders
6. The sender can edit an appointment or add more invitees
7. Invitees without Timestamp get an SMS (3 free SMS per day per sender)