A sellout crowd of 35,067. Some of Henderson's former teammates and closest friends, including Dave Stewart, and Henderson, the newly minted Hall of Famer, himself.
It couldn't bring the A's a win, though.
Aaron Hill had a career-high four RBIs, Lyle Overbay hit a solo home run and the Blue Jays survived a ninth-inning rally to beat the A's, 6-5, on Saturday to even their three-game set.
Jack Cust singled, then Tommy Everidge doubled to put runners on second and third with one away in the ninth before Blue Jays closer Scott Downs left with an injury.
Jason Frasor entered for Toronto. Nomar Garciaparra did the same for Oakland, pinch-hitting for Bobby Crosby.
Garciaparra grounded out to Frasor, scoring Cust and moving Eric Patterson, who was pinch-running for Everidge, to third. Ryan Sweeney then hit for Mark Ellis. He was called out looking to end the game.
"I thought it was a little down," manager Bob Geren said of the final pitch. "It was a close pitch. With two strikes, you've got to swing."
Trevor Cahill's struggles continued Saturday night. The Oakland starter surrendered six runs on eight hits (two home runs) and four walks in 5 1/3 innings.
Cahill is 1-5 with an 8.31 ERA in his past seven starts. The rookie had a 2.51 ERA over 43 1/3 innings in his seven starts prior. He's given up at least one home run in his last eight starts, pushing his season total to 23.
"I've been getting behind guys," Cahill said. "They start looking for a pitch and that kind of leads to a lot more home runs."
Brett Cecil, meanwhile, went seven strong innings for Toronto. The A's tagged him for four runs in the second, but that's all the offense they would muster.
"After that inning, it seemed like he got his command back," Geren said. "He pitched well. He pitched backwards a bit, with that curveball setting up his fastball."
Cecil allowed six hits, walked one and struck out three. He's 3-0 with a 1.67 ERA in his past four starts.
Adam Kennedy paced the Oakland offense, delivering a two-out, bases clearing double to give the A's a 4-3 lead in the second and push his hitting streak to a season-high eight games.
Ellis and Rajai Davis each had a hit, improving their hit streaks to six games apiece.
Scott Hairston, who had missed the past four games with a left quad injury, returned to the lineup and went 0-for-4.
Hill went 2-for-5 for Toronto. He hit the go-ahead, three-run homer in the sixth, his 25th of the season. Overbay, Vernon Wells and Raul Chavez also had two-hit showings.
Santiago Casilla and Edgar Gonzalez combined to throw 3 2/3 innings of one-hit ball in relief of Cahill.
Adam Loberstein is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.