Add attendance cost to schema data #5
Description
A number of the groups (particularly conferences) we've collected so far are non-free by design. Meetup.com groups may end up having costs associated with them if they don't find sponsors, since AFAIK Meetup.com isn't free at a certain level.
Examples:
- Hackfort ($30)
- develop.idaho ($20-30)
- Think Big Festival ($100+)
- Girl Develop It ($20)
- Trailhead (some events are free, but some are only for members w/ monthly subscription)
- I think Innovation Collective has a similar free/not-free model to Trailhead