Sarah McBride to deliver historic remarks on Thursday
Presumptive Democratic presidential nominee met with victims’ families
Group joined hundreds of protesters in city’s main square
City is Ohio's ‘Democratic stronghold’
Sheridan Aguirre was born in Mexico, lives in Texas
Co-chair of GOP platform committee among speakers
Defense analyst spoke at Equality Ohio panel
Gathering began a month after Pulse nightclub massacre
'I was very proud of my son for who he was'
Shooting sparked renewed calls for gun control