On Wednesday morning, city officials held a press conference to talk about their preparations for Fiesta safety.
"In the wake of the bombings in Boston, we are being very very aggressive in our preparation of Fiesta," said San Antonio police Chief William McManus.
Police and fire officials said they met with Fiesta organizers immediately after the bombings and have been meeting every day since.
They wouldn't disclose details for security reasons, but said they're beefing up their existing Fiesta security plans and are working with state and federal agencies.
"The public can rest assured that we are well coordinated with all the different agencies that would be available to respond to an incident and we're well prepared as far as our operational plans," said McManus
Fiesta-goers will also have an important role to play in keeping things safe.
McManus said if anyone sees anything unusual, to be sure and report it immediately.
"We want the people to come down enjoy Fiesta (and) be comfortable in your environment but (to) stay vigilant," said San Antonio fire Chief Charles Hood.
"Fiesta is one of the most joyous times in San Antonio every year and we expect it to be that this year," said Mayor Julian Castro. "We encourage folks (who) attend Fiesta to have a good time with their family."
Officials said if you happen to see something suspicious at Fiesta events, call 411-TIPS or text a tip to TIP411. If it's an emergency situation, call 911.