https://www.siliconvalley.com/2023/06/05/oakland-as-fans-raise-27000-worth-of-shirts-for-reverse-boycott/

Oakland Coliseum denizens are planning a reverse boycott on June 13 to tell the world that Oakland A’s fans won’t go down silently amid plans to move the team to Las Vegas from its home of 55 years. The boycott seeks to fill up as many seats as possible at the old stadium for an otherwise nondescript Tuesday night game against the Tampa Bay Rays.

To get butts in seats, a group of fans called the Oakland 68s collaborated with local clothing company Oaklandish to produce and give out to attendees thousands of green shirts that read “SELL” in white across the chest. The Oakland 68s paid out of their own pockets to make the shirts and put a link on their website and social media for fans and any supporters to donate to their cause.