I’m sorry you’re hitting difficulties here.
The first thing to try is simply a flush of the rewrite rules – to do this, just visit the Permalink Settings admin screen. You don’t need to change anything – just visiting it will prompt WordPress to clear and rebuild them.
If that doesn’t help, though I appreciate you indicated having already tried a few troubleshooting steps, could I ask you to try them again in the following order (or just let me know if that is in line with what you already tried):
- Ensure The Events Calendar/Events Calendar PRO are both up-to-date
- Deactivate all other plugins
- Switch to a default and completely unmodified theme, such as Twenty Thirteen
- Now repeat the steps to flush the rewrite rules
- Does the all page for that sequence of recurring events work now?
Assuming it does, reactivate everything once more – testing at each stage to see if the problem has returned.
Does that get you any closer to a solution or at least pinpoint any potential conflicts?