iPhone App Add to Calendar - put address in NOTES for 1 tap Google Map linking
Instead of putting the meetup venue address only in the Location field of the CALENDAR when you click ADD TO CALENDAR feature, include the address in the NOTES.
By doing this, the iPhone recognises the address in the NOTES field and converts it to a google maps search link, allowing ONE CLICK linking to maps rather than needing to remember or copy and paste the address between apps.
Location then need only be the venue name or the town or city (or both!) without all the extra info.
Brian Beatty commented
If you put only address in the Location field. iOS6 will make it link to maps