There are several trade shows dedicated to party supplies and event planning that you can attend to find the best party supply wholesalers. Some of the top trade shows include:

1. National Stationery Show (NSS): Held annually in New York City, the NSS is a leading trade show for the paper and party goods industry.
2. The National Halloween, Costume & Party Show: Held annually in several cities across the US, this trade show is dedicated to Halloween, costume, and party products.
3. Party & Paper International (PPI): Held annually in Germany, PPI is a leading trade show for the party and paper industry, attracting exhibitors and buyers from all over the world.
4. Special Events: This is a leading trade show and conference for the event planning industry, with a focus on event and party supplies.
5. PFA trade show, special PARTY SUPPLY trade show in USA, Member only for independent party retail store .

By attending these trade shows, you can connect with party supply wholesalers and suppliers, view the latest products and trends, and network with industry professionals.