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Elle Logan, who hails from Boothbay Harbor, Maine, already has two gold rowing medals from her time in the US eight. This year she switched to the single and finished fifth in the world championships in South Korea, the first stop on her solo road to the 2016 Olympics. On Sunday afternoon, though, Logan will make a cameo appearance as stroke of the Great Eight, an All-Star collection of the planet’s best scullers, including Olympic champion Miroslava Knapkova of the Czech Republic, at the Head of the Charles Regatta. That means that Logan will be taking on the American eight that won the world title by open water and will be looking to claim the championship event here for the seventh time in 13 years.