If you really want a Divorce Party, make a list of all the stuff your wife prevented you from doing or told you not to do while you were married. The list will be pretty long.
Add all that controlling shit to your party list, if you can fit it on to your list and create your party plan. If that includes an escort then definitely add one to your list.
The reality is, the only reason you did not see one (if that's the reality) was likely because of some sense of loyalty you held.
The important part of a party celebrating a divorce is doing what the fuck you want to do. If an escort is your bottle of champagne then go ahead and pop your cork!