Sunday, July 19, is the last full day for independent presidential candidates to petition in South Carolina. The petition is due at noon, Monday, July 20. Kanye West is holding a rally in North Charleston on July 19, hoping to attract enough supporters to complete his petition. See this story. Attendees must have signed up in advance; social distancing will be enforced.
This technique is somewhat similar to the methods George Wallace used to get on the general election ballot in 1968, in the states with difficult requirements. In California, Wallace held many rallies to attract supporters, so that they could re-register into his American Independent Party at the meetings.