Halloween is capitalized because it's a proper noun. Happy is usually capitalized with it, as it often starts the greeting or sentence.
Yes.
Yes.
No you shouldn't. Party is a common noun which is not capitalized. Halloween party is then saying Halloween is a proper adjective not making party part of the title.
yes
This website that you have listed is not the place for Halloween party ideas. You would be more interested in party city or seasonal Halloween stores for the best product and deals.
Yes, the names of political parties are typically capitalized in a sentence to distinguish them as proper nouns. For example, "I am a member of the Democratic Party."
Mickey's Halloween Party is a separately ticketed event. It would be unfair to guests of the Halloween Party if regular guests were able to have the same experience!
Halloween party music can be found on the site YouTube. Here one could create a playlist that would be great to suit the needs of any kind of Halloween party.
For great and spooky Halloween decorations, your best bet would be go to a store specializing in party decorations, such as the store Party City and Halloween Express.
You can find Halloween party ideas in websites such as www.halloweenpartyideas.org/; www.celebrations.com/halloween-party-ideas; and www.familymanagement.com/holidays/halloween/party.ideas.html
They came out in a Halloween party. They may come out in a future Halloween party.
Halloween block party in Athens, Ohio.
Spooky halloween decorations would include things such as ghosts and ghouls. Try party city or your local party store to find spooky halloween decorations.