Can you use JotForm to do electronic registration at an event?

Is there a way to use JotForm and do you have an element of JotForm that can be used to have an electronic registration check in at an event.

We would use a jotform to collect the rsvps, but want to be able to take what we collect and upload to a registration application so that we can have an event check-in

Are you planning to connect the form submissions to an external database?

It is possible to send the form submission to your own MySQL database using PHP. Please refer to this guide: How-to-send-Submissions-to-Your-MySQL-Database-Using-PHP.

You might also want to check JotForm Webhooks. Here's a guide: How-to-Setup-a-Webhook-with-JotForm.

We have an API documentation that you might want to check. Here's the link: https://api.jotform.com/docs/.

We do have a widget called Appointment Slots. This widget is perfect for showing your form users what times are available for an appointment. You can check this demo form.

You may also use the Bookings app. This adds a  functionality to a DateTime field to show unbooked slots and allow the user to book them. Here's the link: http://bookings.jotform.io/.

Hope that helps. If you have any questions, let us know. Thank you.

Maybe I didn't explain it clear enough.

What we want to do is we have an RSVP form set up already via Jotform. We would like to be able to have an electronic check-in via a table when it is time for the event that will plug our RSVPs information from the form into an app that will have the RSVP information already uploaded. When a guest comes to check in, we do a search by last name, have the cell number and are able to send a text to them after they check in from an app.

Is this something that Jotform can do or, is there some other method to take care of this?

Ok, you can load data to the form from a spreadsheet and here is a guide that will help you doing so: https://www.jotform.com/help/442-How-to-Use-the-Spreadsheet-to-Form-Widget 

Unfortunately, I think it will not be possible to load the data from an app at least the you use the search functionality from the app and generate the link with the custom data to the form, this guide will help you creating a prepopulated link to your form: https://www.jotform.com/help/71-Prepopulating-Fields-to-Your-JotForm-via-URL-Parameters 

I hope this helps.