After qualifying second behind Bottas for Sunday's race, Hamilton said he had acknowledged a lot of the drivers who had followed a message he posted by ending their silence and using their social media platforms "because they have a great voice and platform."
The drivers are expected to wear t-shirts bearing a message "End Racism" before the race.
He said he had not decided what he would do before the race.
"I don't have any plans - I haven't thought that far forward, but I am sure that over the evening, we will.
"It was good that we are all at least in discussion."
On the track on Saturday, meanwhile, Finnish driver Bottas outpaced Hamilton with a best lap in qualifying in one minute and 2.939 seconds and then survived an 'off' into the gravel and a spin on his final lap to remain 0.012 seconds clear of the Briton.
It was Bottas' third pole at the Austrian Grand Prix and the 12th of his career.
Max Verstappen was third for Red Bull, half a second adrift of the two newly-painted 'black arrows' cars whose dominating performance delivered a 65th front row lock out for Mercedes, equalling Ferrari's record.
Lando Norris was an impressive fourth for McLaren ahead of Alex Albon in the second Red Bull and Sergio Perez who was sixth in Racing Point's 'pink Mercedes'.
Charles Leclerc was a disappointed seventh for Ferrari ahead of his future team-mate Carlos Sainz in the second McLaren, Lance Stroll in the second Racing Point and Daniel Ricciardo of Renault.