Well, first of all, I'd seriously consider using another non confusing, semantic URLs. Assuming this is not possible, I'd recommend you to track your user's behavior and see what happens.

Nevertheless, the solution for your problem is quite simple: just use htacces to redirect any user that hits somesite.com/event/ to somesite.com/events/ and you'll have all bases covered.

Then again, try working out your non-semantic URLs first, and track your user's behaviors so you can have an accurate view of what's going on with your site

Well, first of all, I'd seriously consider using another logic that implements non confusing, semantic URLs. Assuming this is not possible, I'd recommend you to track your user's behavior and see what happens.

Nevertheless, the solution for your problem is quite simple: just use htacces to redirect any user that hits somesite.com/event/ to somesite.com/events/ and you'll have all bases covered.

Then again, try working out your non-semantic URLs first, and track your user's behaviors so you can have an accurate view of what's going on with your site