How often are G7 meetings?

Since 1975, the group has met annually at summits organized and hosted by whichever nation occupies the annually-rotating presidency.

Further details on Group of Seven (G7) is available on the given link.

Further Readings-

1. List of Important Summits in 2021 
2. India And G7 Summit RSTV
3. Carbis Bay Declaration – G7 Summit 2021