Hi and welcome 🙂
We ask that you review our Testing for conflicts guide to rule out potential theme and/or plugin conflicts which we’re unfortunately unable to support here in the forums.
Please let me know what you find out and we’ll continue troubleshooting your issues. If you’d like to customize any aspect of your calendar, please review our Themer’s Guide. This is how you would go about removing the navigation links to past/upcoming events on your single event pages.
It would also be beneficial if you could provide a little more explanation in regards to the issues you’re having. For example, you say an event maintains last years speaker rather than this years, but I’m not exactly sure which event you’re referring to. Screenshots are always helpful.
Thank you and have a great rest of the day. Cheers!