I have no idea of and make no claims as to the claimed authenticity of this via another website, but it's kind of nice...not sure if it's anything you can use, but, oh well, what the hell, here 'tis(!):

End of the Wedding Toast: The wedding party gathers around the bride and groom. All fill their glasses with mead and the newly wedded couple recites an Irish toast: "Friends and relatives, so fond and dear, 'tis our greatest pleasure to have you here. When many years this day has passed, fondest memories will always last. So we drink a cup of Irish mead and ask God's blessing in your hour of need." The guests respond: "On this special day, our wish to you, the goodness of the old, the best of the new. God bless you both who drink this mead, may it always fill your every need."

I found one site that, for the pittance of $35US, they will write a poem, speech, toast, etc. for an Irish wedding abroad, relevant to the assumed Irish audience! They have a similar service for all manner of events!