Get upcoming investor-relations events for a stock — earnings webcasts, conference appearances, presentations, and shareholder meetings — scraped from the company's IR website. Returns events scheduled from now onward, soonest first, optionally filtered by event type. Coverage is partial — an empty answer distinguishes a coverage gap from a genuinely empty calendar. Only future events are returned; for past events and their transcripts use ListInvestorEvents / GetInvestorEventSpeakers.
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