If you’ve spent time on the film festival circuit, you’re probably aware of the “hidden gem” reputation of the San Sebastián International Film Festival. The “gem” part is easy to explain: global cinema, glittery stars, enthusiastic locals, a size that allows for real connections, world-renowned cuisine and the inimitable charm of this bay-set Basque city. It’s the “hidden” part of the equation that raises some eyebrows.  After 73 editions, San Sebastián still remains slightly off the radar for some in the industry, shadowed by its bigger European counterparts. Despite its melding of international auteurs and A-list celebrities, SSIFF is sometimes pigeonholed as mostly focused on Spain and Latin America. Timing is also not in its favor: The September fest comes on the heels of Venice and sometimes overlaps with Toronto, meaning it battles titans for world premieres.  “I think one of the San Sebastián Film Festival’s strengths is its awareness of its core characteristics and its refusal to try to be anything else,” says SSIFF director José Luis Rebordinos, who will retire after 15 years following …