Changes to GET /api/v2/public/events

the results/items/mainurl response property's maxLength was unset from 200 for the response status 200

added subschema #1 subschema #2 to the results/items/mainurl response property oneOf list for the response status 200

the results/items/mainurl response's property type changed from string to no type, and format from uri to no format for status 200