Hi, here is feedback on your comments:
1) By default, Event Espresso needs a name and an email to process a registration. The address question group is optional and can be unchecked through the event editor:
https://cl.ly/image/32370m3q1n0F
Be sure to save changes to the event via the event editor after unchecking it.
Creating new questions and question groups is available in the regular version of Event Espresso 4.
2) The 403 message was being triggered by base64 encoding in the ticket selector. We’ve removed the use of that approach with Event Espresso 4.4.9.x and above.
3) The Event Espresso 4 decaf plugin does not include a calendar. An events calendar add-on is available from our store.
Thanks and enjoy your week!