- Joined
- Jul 28, 2009
- Member Type
- English Teacher
- Native Language
- British English
- Home Country
- UK
- Current Location
- UK
No. The use of "if" shows uncertainty. You don't know if the person is going to be free so you are uncertain if they will be able to come.
The single most natural statement for this entire thread is "If you are free this evening, please come to [relevant place]".
The single most natural statement for this entire thread is "If you are free this evening, please come to [relevant place]".