I realize you're just asking when an upcoming expo will take place, however...

[soapbox]
Have you & your friends done research on what kind of birds you're looking for, and what the care requirements are for the particular species? Birds are a horrible impulse buy - many are high maintenance & need consistent attention.

Wanting any bird at a low price is usually not the best way to get off on the right foot when keeping them as pets...you often get what you pay for (i.e. problem animal, one that's not well, etc). Do lots & lots of homework, figure out what species you can properly accommodate & care for, and then look around online to see what average prices are, THEN go back, do a lot more homework and decide if you're truly ready to make the commitment of bird ownership. Please don't just jump in on a whim.
[/soapbox]

Good luck!

K~