Create Users?

Hello, can i have users or members sign a general form once, so their general info gets storage already and ion the future they would only have to ONLY complete the fields that are unique to that specific form? like events or rsvp or unique services?

So as far as I could understand your issue you want a single form to be signed by a user at first and later in future they will edit the same form to add  unique information ?

If so, yes it is possible. After submitting the signed form you can send Auto Responder in custom date.

https://www.jotform.com/help/535-Utilizing-the-Send-Emails-Later-Function-of-the-Autoresponder-Emails

In order to Edit forms in later day , please refer to this guide.

https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date

You can also set unique question, please follow this guide to know more about it.

https://www.jotform.com/help/375-How-to-Have-Unique-Question-Using-Multiple-Fields

Feel free to contact.