Frances Perkins may have been the first lesbian Cabinet pick
Former US ambassador to Germany will be special missions envoy
Press secretary's promotion was reported on Monday
Oval Office sit-down was the first for an LGBTQ newspaper
New nondiscrimination rules took effect last week
First lady celebrated historic pardons of LGBTQ veterans
Move will facilitate access to benefits they were denied
Event to take place on June 26
Karine Jean-Pierre also highlighted mental health efforts
Directive 'catastrophic' for LGBTQ asylum seekers