The phrase "interested spectators" refers to people who are watching something with curiosity or a desire to know more, but are not actively involved in the event or situation. They are interested observers or onlookers. Full definition
The company also provided interested spectators with samples of Source's water, which is enhanced with minerals before being pumped into your sink's plumbing. (inc.com)
Legal challenges to the government's consultation, concerns over the hybrid nature of the legislation (this means it takes much longer to work its way through parliament) and the coalition's decision to split the legislation into two parts are worrying interested spectators — like Labour's Eagle. (politics.co.uk)
Chelsea face Bournemouth in the late game and Spurs, with Harry Kane making his return against the Hornets, will be interested spectators with the gap now just four points. (footballwhispers.com)