Rain is not looking fun tonight! Here is another great option:
Celebrate Fairfax
Halloween at The PARC at Tysons
8505 Leesburg Pike, Vienna
Monday, October 31st 4pm-7pm
Join us for a spooky good time- now INDOORS due to weather forecast. Come as you are or in full Halloween attire for a safe and easy way to celebrate all things Halloween! Fun for all ages includes trick or treating, face painting, kettle corn giveaway from Colonial Kettle Corn, interactive slime experiments from Mad Science and Sam the Balloon man.
https://celebratefairfax.org/event/halloween-at-the-parc/