Birthday party ideas

My not so little boy has asked for a birthday party we will be turning 6 has anyone had one at kiddiewinks soft play are they any good ? or any other suggestions that are affordable he wants to invite the whole class so no one feels left out i’ve always had a massive fear of party’s as when i was a kid i had one and no one showed up my heart would break if that happened to him but he’s a caring boy and wants everyone to get an invite so a place that would hold 31children (there is 30 in a class including my son plus his younger brother)