I will be attending vs I will attend

Some examples from the web:

• I will be attending an all-day abstinence rally.
• Kensi and I will be attending the Timmy Robertson Train to Financial Freedom seminar this Friday.
• I will be attending the class to make sure my instructions are followed.
• Billy and I will be attending the energy conference as partners.
• I will be attending the parade as always.
• Yes, I will be attending the engagement party.
• If you die within the next six years, I will be attending your funeral and giving a eulogy when POTUS sends me there in his stead.
• While both are valid choices, I will be attending Kono's wedding in a more traditional palate.
• I will be attending mass next Sunday morning in the cathedral in Hong Kong with my friends in the parish, as I used to when I was Governor.
• - You and I will be attending a separate conference at the same hotel.
• The Ulm conference, which I will be attending on 1-2 February, marks a first step in the consultation process.
• I only have to apologise that I will be absent for tomorrow's vote, as I will be attending the Labour Party Conference in Manchester.
• I am pleased to confirm that I will be attending the meeting of the Assembly in Gabon next week.
• I will be attending parents' evening this Thursday.
• tonight I will be attending a movie premiere with Burt Reynolds.
• I will not be able to be present during the vote, because I will be attending the European Council in Brussels.
• [I will be attending the Coming-Of-Age Ceremony on the Island next year.]
• And since only Clive and I will be attending the reception, we'll have the only chance to get the computer and get those files.

Some examples from the web:

• I look forward to the European Union taking up these abuses at the UN Commission on Human Rights in Geneva, which I will attend on 27 March.
• I will attend both the opening and the conclusions of that conference, and I am very hopeful that it will bring up a number of issues related to SSGI to guide us forward.
• Well, then I will attend it tomorrow.
• If I am still here, I will attend with pleasure
• Officer, I will attend to this in a grave and serious fashion.
• I will attend you as soon as circumstance allows.
• Neither Ip Man nor I will attend.
• You can notify Mr. Palmer that I will attend.
• Tell Reuben Huckaback I will attend to his petition.
• It's a task that I will attend to.
• I will attend an international police seminar in London.
• If you wish it, I will attend.
• My husband's out of town for work, so of course I will attend your dinner.
• I will attend in one week on one condition.
• And out of love, I will attend her ritual.
• The issue of voice and representation will be discussed at the IMF World Bank annual meetings in Istanbul, which Commissioner Almunia and I will attend this October.
• Where I will attend the University of Miami for six months to get my graduate degree in Marine Biology with a concentration in Dolphin History while Cleveland takes care of you kids and all the housework.
• A league orientation meeting, which I will attend, and I will speak for Donny.
• Those discussions are referred to in our discussions with the United Nations, which I have also indicated are ongoing, and NATO, where I will attend a meeting tomorrow.
• I will attend you presently, if this maniac will hold his tongue!