The tear off calendar emoji is a good choice for a call to action. If you are offering any sort of a booking, having a unique link that takes them straight to your booking instead of a long URL looks better and cooler. You gotta admit having a link that looks like this:
www.📆.tk or 📆.tk
is waaaay better than having a link that looks like this:
If a short, intuitive emoji domain name like this interests you, get in touch with me and I can help you make this a reality.