Answer: rsvped

AnswerCrossword Clue
RSVPED

Said "I'll be there"

RSVPED

Used a bride's SASE, say

RSVPED

Offered regrets, perhaps

RSVPED
Answered an invitation
RSVPED
Did an epistolary courtesy
RSVPEDAnswered, quickly
RSVPEDSaid "I'll be there with bells on," say
RSVPEDLet someone know if you can go
RSVPEDGot back (to)