It depends on your employer. They can use you speaking there to promote the company. So in my case I didn't have to take vacation days. Still I didn't get any time of to prepare, so there's still it takes a lot of spare time to prepare.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
It depends on your employer. They can use you speaking there to promote the company. So in my case I didn't have to take vacation days. Still I didn't get any time of to prepare, so there's still it takes a lot of spare time to prepare.