On occasion, we have hiring events on evenings or weekends. Would you be able to work those events?

If you are not able or willing to work events outside of normal business hours, be honest and let the interviewer know. If you have certain restrictions or need advanced notice, be clear on that now. This is your opportunity to ensure your availability lines up with the position requirements.

"In general, yes, I can absolutely work events on evenings or weekends. There would be occasions when I have something scheduled that I cannot miss, but those are few and far between. I understand working events outside of normal business hours is a requirement of the job and it is one I am prepared for."