Dear Concerned,

Regarding the Gloria, the GIRM says that it is said "in special, more solemn celebrations" (n.53)  Whether or not that would include a personal anniversary on a Friday during Lent I suppose could be up for debate, but in my own personal opinion I wouldn't recite it.  But I can't say for sure that it's absolutely "banned" either.

You may have celebrations during Lent.  Anniversaries, birthdays, and whatever occur at all times during the year.  Although the character of Lent is penitential, one still may mark personal achievements with a celebration, even on a Friday.

In order to eat meat on Friday, though, your pastor would need to have gotten a dispensation from his bishop.  Honestly I don't know if the bishop even has the authority to grant a dispensation for a personal reason (the ten-year anniversary).  I know that if it were me, I wouldn't even ask, I'd probably either not serve meat at all or better yet move the celebration to Saturday.

But to clarify, the priest does NOT have the authority to excuse himself and his guests from the obligation to abstain, for any reason.

Mr. Slavek