I keep getting in at the end of Limbo's when the event boss is being killed, and i just had it reset without allowing me the option of going in at all.

Am I doing something wrong? Or is it just hit or miss?

Thanks.

Hit or miss, try to join right when the timer resets

Hit or Miss Party up with someone. Sometimes you can get into different ones.

Thanks, figured it was just a by chance type of thing.