Send-Off
Farewell
noun, の adjective
You want to make someone feel robust when they go away somewhere, so you give them a send-off. It's just a nice way to say farewell!
壮行 is usually for celebratory send-offs and appears in words like 壮行会 (farewell party) or 壮行式 (pep rally).
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
彼のために金曜日壮行会を予定してるんですが、ご都合は如何ですか？
We are planning a farewell party for him on Friday. Are you available?