Trading in influence, or influence peddling, refers a person selling his/her influence over the decision making process to benefit a third party (person or institution). The difference with bribery is that this is a tri-lateral relation. From a legal point of view, the role of the third party (who is the target of the influence) does not really matter although he/she can be an accessory in some instances. It can be difficult to make a distinction between this form of corruption and some forms of extreme and loosely regulated lobbying where for instance law- or decision-makers can freely "sell" their vote, decision power or influence to those lobbyists who offer the highest compensation, including where for instance the latter act on behalf of powerful clients such as industrial groups who want to avoid the passing of specific environmental, social, or other regulations perceived as too stringent, etc. Where lobbying is (sufficiently) regulated, it becomes possible to provide for a distinctive criteria and to consider that trading in influence involves the use of "improper influence", as in article 12 of the Criminal Law Convention on Corruption (ETS 173) of the Council of Europe.
In some situations the third-party in an influence peddling crime may be not involved or may be what?
an accessory

Aristotle however suggested that swallows and other birds hibernated. This belief persisted as late as 1878, when Elliott Coues listed the titles of no less than 182 papers dealing with the hibernation of swallows. Even the "highly observant" Gilbert White, in his posthumously published 1789 The Natural History of Selborne, quoted a man's story about swallows being found in a chalk cliff collapse "while he was a schoolboy at Brighthelmstone", though the man denied being an eyewitness. However, he also writes that "as to swallows being found in a torpid state during the winter in the Isle of Wight or any part of this country, I never heard any such account worth attending to", and that if early swallows "happen to find frost and snow they immediately withdraw for a time—a circumstance this much more in favour of hiding than migration", since he doubts they would "return for a week or two to warmer latitudes".
Until what year did the belief of hibernating birds persist?
1878

On 20 April 1992, The Freddie Mercury Tribute Concert was held at London's Wembley Stadium to a 72,000-strong crowd. Performers, including Def Leppard, Robert Plant, Guns N' Roses, Elton John, David Bowie, George Michael, Annie Lennox, Seal, Extreme, and Metallica performed various Queen songs along with the three remaining Queen members (and Spike Edney.) The concert is listed in the Guinness Book of Records as "The largest rock star benefit concert", as it was televised to over 1.2 billion viewers worldwide, and raised over £20,000,000 for AIDS charities.
When was the Freddie Mercury Tribute Concert held?
20 April 1992