Members and allies of the LGBTQ community volunteered to speak at the candlelit event.
Bulldozers will begin work within two weeks of the groundbreaking to build the multi-purpose adult center.
Philadelphians and students gathered for a candlelight vigil at City Hall.
Police did not find any explosives after a three-hour search of the building.
A casting call was held on Saturday in Alter Hall, inviting members of the Temple community to pitch their ideas to be considered for a spot on the hit show.
Police say they believe the three victims may have been shooting at each other, but are still investigating.
The shootings happened in the same place and almost within 24 hours of each other.
Police said the shooting was an accident and no arrests have been made.
No arrest has been made following Friday morning's TU Alert.
A trial date has not been set in the case.