No, I wouldn't mention Stalin. I'd focus on historical socialism here in America (The ties between labor and socialism, Eugene Debs) and in Western-Europe. (French Socialism, Fabian Socialism, Europe's Post-War Recovery, Universal Health Insurance, Etc.)
I'd also mention Latin American Socialism (Castro, Chavez and Morales) as a rebellion to the Washington Consensus (Depressions in Argentina, U.S. Imperialism, Privatization of Water and Energy, Free-Market Tyranny (Chile), Etc.
Should you be questioned on Stalin and Mao: I'd focus on Genuine Socialism (Marxian) taking the form of democratic socialism
Social democrat telling us about genuine socialism. 
If you don't mention Stalin/Mao people will think that you're hiding something. Hit them with information about capitalism's biggest bogeymen.
“How in the hell could a man enjoy being awakened at 6:30 a.m. by an alarm clock, leap out of bed, dress, force-feed, shit, piss, brush teeth and hair, and fight traffic to get to a place where essentially you made lots of money for somebody else and were asked to be grateful for the opportunity to do so?” Charles Bukowski, Factotum
"In our glorious fight for civil rights, we must guard against being fooled by false slogans, as 'right-to-work.' It provides no 'rights' and no 'works.' Its purpose is to destroy labor unions and the freedom of collective bargaining... We demand this fraud be stopped." MLK
-fka Redbrother