We have been using event espresso for 18 months just fine, but with our newest events we have posted, when you click register, it takes you to the event description but has no way for people to proceed with the registration. You can view our registration page at https://www.themelodyinme.ca/event-registration/
It looks like the ticket selector and the event date is being stripped from the individual event pages. This may be the result of a plugin or theme conflict.
One way you can rule out a plugin or theme conflict is by installing the Health Check plugin, then go to WP → Dashboard → Heath Check → Troubleshooting. There you’ll Enable Troubleshooting Mode, then once that’s activated you’ll reactivate Event Espresso only via the Health Check’s Troubleshooting item in the WP admin bar. At that point, can you check to see if the issue persists?