"I'll be participating" is correct and usable in written English.
You can use it when you intend to join or participate in something. For example: "I'm excited to announce I'll be participating in the upcoming charity run."
| Related Event | I'll be participating in a panel discussion tonight on gas drilling and the fracking process at the Carey Conference Center in Rensselaerville, N.Y.
Just a word to say that tomorrow night, after the New York Film Festival's first screening of Jean-Luc Godard's latest film, "Film Socialisme," I'll be participating in a panel discussion about the film with Jean-Michel Frodon (the former editor of Cahiers du Cinéma and former film critic at Le Monde) and Annette Michelson (the founding editor of October and former film critic at Artforum).
Later tomorrow I'll be participating in a session on social computing and the enterprise along with Matt Cohler, Reid Hoffman, Robert Scoble, Jimmy Wales and others.
I'll be participating two miles down the road".
Later in the year I'll be participating in The Wrong Biennale, that will be opening November 1 , 2013
I look forward to this week's Aspen Institute Franklin Project Summit at Gettysburg, where I'll be participating on a June 4th panel focused on national service and the American character.
"I will be participating in a number of other events to honor the Irish heritage of this city and the contributions of Irish Americans," he said, on 4 February.
David and I will be participating in an open video Q&A using Google Hangout tomorrow.
"I will be participating in the search for my successor, and I will continue as CEO until the board selects a new CEO.
This is the first major live event for the young company and I will be participating so catch me on Twitter to see the madness unfold this weekend.
"I will be participating," former Rep. David Jolly (R-Fla).
