Thank you for the invitation to this event. I am free on Saturday night, so I can go.
I am interested because I have never been to an event like this. I am really excited because when I was a kid, I wanted to be an astronomer.
The perfect time for me is between 10:30 and 11:30 because I am at work until 9 and I need to have a shower, to eat something and prepare for the night.
See you on Saturday!