An Open Call campaign is when a Cajole is created and offered to no one person in particular.
If you feel the Cajole speaks to you and you are able to fulfill the task for the amount offered, consider throwing your name in the ring.
After the campaign ends, anyone can apply to accept the Cajole.
Users can only apply to or fulfill one Open Call campaign at a time. If an applicant doesn't complete the Cajole they are assigned, they will be blocked from applying to another Open Call campaign for 3 months.