looking for wording for a surprise wedding anniversary party?

we are having a surprise 40th wedding anniversary party for my in-laws and I have no idea on how to word the invites? any help would be helpful!
thank you!

Please join us for a party in celebration of Mary and Bob’s 40th wedding anniversary

Date and Time
Place
RSVP

Shhh…it’s a suprise, so please hold your enthusiam for the party!

Cox 50th Wedding Anniversary Video

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