Q. How do I do an in-text citation for a press conference?

Whenever you present another author's information in your paper, you should include an in-text citation that lets the reader know where you found the information.  In-text citations generally include the author's last name and the page number where you found the information.  If the source you are citing does not have page numbers, you can just use the author's name.  If the author's name is not available, use the title of the source in the citation instead.

From the Purdue OWL MLA In-Text citations (Link Below):

General guidelines

• The source information required in a parenthetical citation depends (1.) upon the source medium (e.g. Print, Web, DVD) and (2.) upon the source’s entry on the Works Cited (bibliography) page.
• Any source information that you provide in-text must correspond to the source information on the Works Cited page. More specifically, whatever signal word or phrase you provide to your readers in the text, must be the first thing that appears on the left-hand margin of the corresponding entry in the Works Cited List.

The final format of your in-text citation will depend on the citation on your Works Cited page and format of the press conference (in print, on a Web Page, on TV or radio, etc.).  

For more information on creating MLA citations, check the Purdue OWL pages.