merge of T2 info: unconfirmed
The Festival of Thoth requires an altar surrounded by 21 scampering beetles, and a sacrifice of an ambrosia made from a specific (12 percent alcohol, 2 vintage old) wine and ink.
Try the Wine Inventory to find a supplier for your wine and any beetle breeder for ample spares.
Dropped beetles disappear in roughly 3-4 minutes. Since it can take a minute or two just to pick them all up, it would be wise not to drop any you're afraid to lose. Keep a few extras on hand as well.
For humor value after the festival, turn the beetles into bags (self->utility->make nearby portables look like bags). They still behave as normal beetles; only the way the client renders them changes.
Please don't worry about producing the wine for these ambrosias. There are people who have been spending time doing it so you don't have to, often with little or no cost to you. Please check the Wine Inventory and find a vintner making what you need.
See also: Test Of Festivals, Determining Festival Requirements,Festival Suppliers, Festival Needs, Wine Inventory, Festival Schedule, Festival Player Progress, Festival Altars.