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Stuff we’re thinking about going to

Nov. 25 Riptide: Hamptons Sink or Swim 3:30-6 p.m., Southampton Arts Center i-Hamptons, the Southampton-based resource guide for local entrepreneurs, hosts its first-ever “Shark Tank”-like pitch event featuring four finalists in a head-to-head business-plan competition with $25,000 in prize money at stake. Sponsors include Silicon Valley Bank, Hampton Luxury Liner, Omnigon, Farrell Fritz, the Southampton Social Club and The Spur, a private co-working and entrepreneur’s club slated to open in Southampton in 2018. Admission is free…