2020: Decision of November 16, 2020 to postpone the 2021 conference from May to August 16-19, 2021. 2021: Held August 16-19, 2021 in person with online participation: 'While this year was undoubtedly different from previous events... Despite a reduced footprint this year, OTC spurred valuable networking' (letter of Aug. 19, 2021). Usual dates: First week of May (2021: scheduled May 3-6; held August 16-19, 2021). Scale: Held 'despite a reduced footprint this year' with attendees 'both in-person and online' (Ex. SEC-23-GM-004); the 2021 event was co-located with NAPE Summit ('Synergy in Energy'). Venue orders 2020: TX-025, TX-022, TX-026, MET-HOU-043, MET-HOU-020, MET-HOU-023. Venue orders 2021: TX-036, TX-037, TX-038, MET-HOU-037, MET-HOU-039, MET-HOU-052, MET-HOU-053, FED-020, FED-021, FED-051, FED-052, FED-053, FED-054. Also cancelled by this notice: NAPE Summit 2020 and 2021 (winter expo) (Houston (George R. Brown Convention Center), TX; usual dates First week of February (2020: February 5-7, held before the orders; 2021: scheduled February 2021, held August 18-20, 2021 with OTC); venue orders 2020: TX-025, TX-026, TX-022, MET-HOU-043; venue orders 2021: TX-029, TX-031, TX-036, MET-HOU-034, MET-HOU-037, MET-HOU-039, FED-020, FED-051). Also cancelled by this notice: Q3 2021 INVENTORY: the gatherings of this industry held or scheduled July 1-September 30, 2021 and the orders in force on their dates (Houston; Las Vegas; Denver; New Orleans; Louisville; New York; San Francisco; Los Angeles; Honolulu, US; usual dates OTC and NAPE Summit Aug. 16-20, 2021 (Houston); URTeC July 26-28, 2021 (Houston); MINExpo Sept. 13-15, 2021 (Las Vegas); IMAGE '21 Sept. 26-Oct. 1, 2021 (Denver); SPI Sept. 20-23, 2021 (New Orleans); The Utility Expo Sept. 28-30, 2021 (Louisville); Bluefield Coal Show Sept. 2021; venue orders 2021: TX-036, TX-037, TX-038, MET-HOU-037, MET-HOU-039, MET-HOU-052, MET-HOU-053, NV-039, NV-041, NV-042, NV-043, NV-044, MET-LAS-006, MET-LAS-009, CO-041, CO-043, CO-046, MET-DEN-021, MET-DEN-022, MET-DEN-026, MET-DEN-023, MET-DEN-025, MET-DEN-033, LA-035, LA-036, LA-038, LA-040, MET-MSY-026, MET-MSY-027, MET-MSY-028, MET-MSY-029, MET-MSY-030, MET-MSY-032, MET-MSY-063, KY-049, KY-052, KY-057, KY-058, MET-SDF-005, MET-SDF-017, MET-SDF-028, FED-020, FED-021, FED-051, FED-052, FED-053, FED-054, FED-232, FED-233, FED-234, FED-235, FED-255, FED-256, FED-257, FED-258, MET-NYC-017, MET-NYC-018, MET-NYC-019, MET-NYC-021, MET-SFO-010, MET-SFO-011, MET-SFO-017, MET-SFO-071, MET-LA-018, MET-LA-019, MET-LA-035, MET-LA-036, MET-HNL-032, MET-HNL-033, MET-HNL-035, MET-HNL-037, MET-HNL-038, MET-HNL-052, HI-023, HI-024, HI-025, AK-041, NM-060, NM-062, KS-056, KS-057, VA-037, CA-024, CA-029, OR-041, OR-044, AZ-079, MET-DFW-028, MET-DFW-030, MET-DFW-031, MET-AUS-024, MET-AUS-030, MET-PIT-036, MET-PIT-051, MET-ORL-047).