def get_inauguration_date(self, year):
if ((year - <NUM_LIT:1>) % <NUM_LIT:4>) != <NUM_LIT:0>:<EOL><INDENT>raise ValueError(<EOL>"<STR_LIT>".format(year))<EOL><DEDENT>inauguration_day = date(year, <NUM_LIT:1>, <NUM_LIT:20>)<EOL>if inauguration_day.weekday() == SUN:<EOL><INDENT>inauguration_day = date(year, <NUM_LIT:1>, <NUM_LIT>)<EOL><DEDENT>return inauguration_day<EOL>
If the year is an Inauguration Year, will return the Inauguration Day
date.

If this day falls on SUN, it's replaced by the next MON.
If the year is not a Inauguration Year, it raises a ValueError.