Say your child is invited to a friend birthday party. Would you be annoyed if the invite stated only one parent could come to the party?

Thinking about DD1's 4th birthday and am considering the zoo. The thing is you're only allowed up to four adults free then you have to pay an additional $8/adult for admission unless they're members. Plus food & drink cost for the adults.

What do you think?

Just trying to figure out if this is financially feasible for us.