Presidential Debate

All seven Democratic presidential aspirants will converge on Harvard tonight to debate arms control and disarmament. No public seating is left for the hour-long discussion, slated for 8 p.m. at the Kennedy School of Government, but it will be broad cast live on WCVB-TV Channel 5.

The event marks the second time that former Florida Gov. Reubin Askew, California Sen. Alan Cranston, Ohio Sen John Glenn, Colorado Sen. Gary Hart, South Carolina Sen. Ernest F. Hollings, former South Dakota Sen. George McGovern, and former Vice President Walter F. Mondale have faced each other in the campaign.