Conferences with sessions for undergraduates to present their research:
2015 CURM Student Research Conference
March 20-21, 2015 at Brigham Young University, UT

Joint AMS/MAA Mathematics Meeting: there are the undergraduate research poster session and special sessions for undergraduates to give oral presentations. Also, the MAA should have travel grants of $500 for student presenters (contact Michael Dorff for more information)
January 10-13, 2015 in San Antonio, TX

MAA MathFest: there are special sessions for undergraduates to give oral presentations. The MAA should have travel grants of $400 for student presenters (contact Michael Dorff for more information)
August 5-8, 2015 in Washington, DC

MAA funds Regional Undergraduate Mathematics Conferences (RUMC). Each year there are about 30 of these in the U.S. and each has funds to support regional student travel and food for both speakers and non-speakers (contact Michael Dorff for more information). It is beneficial for students to attend even if they are not giving a presentation. Here is a tentative list:

Sept 20, 2014: Minot State University, Minot, ND
Oct 4, 2014: Centre College, Danville, KY
Oct 4, 2014: James Madison University, Harrisonburg, VA
Oct 10-11, 2014: Kennesaw State University, Kennesaw, GA
Oct 10-11, 2014: Western Kentucky University, Bowling Green, KY
Oct 17-18, 2014: Stephen F. Austin State University, Nacogdoches, TX
Nov 1, 2014: Utah Valley University, Orem, UT
Nov 7-8, 2014: Millikin University, Decatur, IL
Nov 7-8, 2014: St. Norbert College, de Pere, WI
Nov 8, 2014: Missouri State University, Springfield, MO
Nov 8, 2014: Southern Illinois University, Carbondale, IL
Nov 15, 2014: College of Wooster, Wooster, OH
Nov 15, 2014: Lee University, Cleveland, TN
January, 2015: Florida Gulf Coast University, Fort Myers, FL
Feb 20-21, 2015: United States Air Force Academy, Colorado Springs, CO
Feb 21, 2015: Highline Community College, Des Moines, WA
Feb 21, 2015: Mercer University, Macon, GA
Feb 21, 2015: Youngstown State University, Youngstown, OH
Feb 27-Mar 1, 2015: The University of Texas at El Paso, El Paso, TX
Mar 7, 2015: Towson University, Baltimore, MD
Mar 14, 2015: Saint Mary’s College of California, Moraga, CA
Mar 27, 2015: Francis Marion University, Florence, SC
Mar 27, 2015: University of Puerto Rico, Mayaguez, Puerto Rico
Mar 28, 2015: Loyola Marymount University, Los Angeles, CA
Mar 28, 2015: Morehouse College, Atlanta, GA
Mar 29, 2015: Dordt College, Sioux Center, IA
Apr 4, 2015: Troy University, Troy, AL
Apr 9-11, 2015: Embry-Riddle Aeronautical University, Daytona Beach, FL
Apr 10-11, 2015: Rose-Hulman Institute of Technology, Terre Haute, IN
Apr 11, 2015: Furman University, Travelers Rest, SC
Apr 11, 2015: Monmouth University, West Long Branch, NJ
Apr 11, 2015: Union College, Schenectady, NY
Apr 11, 2015: University of Tennessee, Knoxville, TN
Apr 11, 2015: University of Washington, Tacoma, WA
Apr 11-12, 2015: Simpson College, Indianola, IA
Apr 11-12, 2015: St. John’s University, New York City, NY
Apr 18, 2015: Manhattan College, Bronx, NY
Apr 25, 2015: Temple University, Philadelphia, PA

Other Undergraduate Mathematics Conferences

MAA Sectional Meetings

NCUR, National Conference on Undergraduate Research
Apr 16-18, 2015 at Eastern Washington University, Spokane, WA

Your own university’s Undergraduate Research Day