Here's an example of two related venues, one representing the venue at which an event occurs, and another representing a suggested parking facility.
BEGIN:VVENUE VENUE-ID:V0email@example.com NAME:The Venue DESCRIPTION: The Venue is a home for live music and southern-insp ired cuisine in an environment celebrating the African American cult ural contributions of blues music and folk art. In 1992, our company converted a historical house in Cambridge, Massachusetts into the o riginal The Venue. The original The Venue opened its door on Thanksgiving Day, 1992 feeding the homeless before opening to th e public. Our commitment to serving the community will always be a p riority. ROOM:Stage 2 ADDRESS:1055 Fifth Avenue\nSuite 4 CITY:San Diego REGION;ABBREV=CA:California COUNTRY;ABBREV=US;ABBREV=USA:United States POSTAL-CODE:92101 TZID=US/Pacific GEO:32.716220;-117.160156 URL;TYPE=map:http://maps.google.com/maps?q=1055%20Fifth%20Avenue%2C%20 San%20Diego%2C%20California%20&hl=en URL;TYPE=Eventful Listing:http://eventful.com/venues/V0-001-000153774-0 URL;TYPE=Official Site:http://www.example.com/venues/clubvenues/sandieg o/ TEL;TYPE=Box Office:619.299.2583 CATEGORIES:music concert NOTES:Limited free parking is around back. Paid parking is available a t the local Ace Parking lot. RELATED-TO;RELTYPE=CHILD;UID=:V0firstname.lastname@example.org END:VVENUE BEGIN:VVENUE VENUE-ID:V0email@example.com NAME:Ace Parking Fifth Street DESCRIPTION: Public parking lot on the corner of Fifth and A. ROOM:Stage 2 ADDRESS:1042 Fifth Avenue\nSuite 4 CITY:San Diego REGION;ABBREV=CA:California COUNTRY;ABBREV=US;ABBREV=USA:United States POSTAL-CODE:92101 TZID=US/Pacific GEO:32.716224;-117.160167 URL;TYPE=map:http://maps.google.com/maps?q=1042%20Fifth%20Avenue%2C%20 San%20Diego%2C%20California%20&hl=en URL;TYPE=Eventful Listing:http://eventful.com/venues/V0-001-000014351-0 CATEGORIES:parking NOTES:$2/hour, $15/day RELATED-TO;RELTYPE=PARENT;UID=:V0firstname.lastname@example.org END:VVENUE