It is tons of fun. Did it every year she was in school and still do it every year she's at home for Christmas.
And we had bunches of it for her wedding - our music director (who can play anything - and I do mean anything, you can't stump him) played improvisations on themes from the Messiah for her processional, and we all sang the "Hallelujah" for the recessional.
How wonderful that your daughter’s high school exposes students to the finest, and what grand music to include in her wedding! Christmas without the Messiah just wouldn’t be the same-—both literally and figuratively. Merry Christmas to you and your family.