The show, which relocated to the Excel in 2015, attracts stars and fans of online video, as well as the wider entertainment industry. It will take place this year on 12-14 August.
The acquisition follows the launch of the MCM Central brand, previously known as the MCM Expo Group. The rebrand aims to highlight the company's expansion and diversification plans.
New shows debuting in 2016 include London videogames festival GamerMania, Midlands-based tabletop gaming event Strategy and MCM Comic Cons in Brussels and Hannover.
Summer in the City was founded by directors Tom Burns and David Bullas, who launched Vlogger Events to organise and manage the convention. It began in 2009 as a gathering at Hyde Park and later moved to Alexandra Palace.
Bryan Cooney, managing director at MCM, said: "We're delighted that Summer in the City has joined the MCM family. The show fits perfectly into our market position as the UK's leading popular culture events company and we look forward to working with co-founders Bullas and Burns, building on their already incredible event to take Summer in the City to even greater heights."
Burns stated that himself and Bullas would continue to remain "a large part" of the festival. He added: "Becoming part of MCM Central marks the start of an exciting new chapter for Summer in the City. I'm proud of everything Dave and I have achieved up until this point, but can't wait to see the event go a leap further as it benefits from the support and experience that Cooney and his team have to offer."
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