FunPlex is open year round. The outdoor water attractions are only in the summer
You can host an event at Funplex; you may need to contact Administrative Office re: food. My camp went this summer where room was available for kids & CHAPERONES to eat what was provided in group package (pizza & juice). Funplex is open year round (outdoors for summer only).
Indoors is year round. Outdoors starts late spring and lasts until weather permits.
The indoor part is open all year round the outdoor part is not. Also, you do not have to have a birthday party to enjoy the features but it is a good idea to book in advance if you are going to through a party.
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