As far as I know, it's currently not possible using the built-in options available Outlook. So, you would have to forward the entire recurring meeting or forward each instance separately.

Another workaround I can think of is to share the occurrences via CSV file:

1. Export your calendar to CSV file, set the data range to make sure this recurring meeting is included.
2. Open the CSV file in Excel, delete all unwanted lines, leave only the occurrences that you want the colleague to see.
3. Share the modified version of the CSV file to the colleague so that he/she can import it to his/her calendar.

Import and export Outlook email, contacts, and calendar

As far as I know, it's currently not possible using the built-in options available Outlook. So, you would have to forward the entire recurring meeting or forward each instance separately.

Another workaround I can think of is to share the occurrences via CSV file:

1. Export your calendar to CSV file, set the data range to make sure this recurring meeting is included.
2. Open the CSV file in Excel, delete all unwanted lines, leave only the occurrences that you want the colleague to see.
3. Share the modified version of the CSV file to the colleague so that he/she can import it to his/her calendar.

Import and export Outlook email, contacts, and calendar

Export Calendar into CSV Exchaneg 2016