"I invited myself," Harris said after the event. "I really wanted to be a part of it."
Harris performed several Porter Wagoner songs with guitar ace Miller.
Harris told the crowd before they played a note that he June release "Wagonmaster," "has been my favorite record. Try to turn everybody onto it who doesn't have it. T makes me remember why I love country music."
With that, the duo sang "If Teardrops Were Pennies," which Harris said "was always my favorite Dolly and Porter song." Harris was in fine vocal form throughout her appearance.
"Many of us have a chance to say bye to Porter," said Harris, adding, "I'm really grateful to be here tonight."
With that, she launched into "Someone I Used To Know" with Miller on backing vocals on the very heartfelt version of the song.
Lauderdale, who handled the emcee responsibilities, sang "Slewfoot." He told a story about how he once hosted the Grand Old Opry with Wagoner, telling the crowd, "I like classical music, like Wagner, Porter Wagoner."
Crowell sang two songs as well, including "Love Is All I Need," a song he wrote about losing his parents.
Marty Stuart, who produced "Wagonmaster," was slated to appear, but had another commitment.
Chris Gaffney and Mike Farris also performed.
The event was held at the start of the American Music Association annual conference.