Fundraisers!
In Ontario, "Stag and Does" are common occurrences. These are fundraising parties that also usually serve as an engagement party or joint bachelor/bachelorette party.
You sell tickets to the event, get your wedding party involved for this! Sell beer for $1-$2. Have tables such as blackjack and other silly games where people have to buy in (at a low price). Get items donated from spas or companies and have a raffle. The successful stag and doe in Ontario makes about $5000!
It's a fun party night for everyone and raises funds for your wedding. To get more ideas, look online under "stag and doe", there are lots of ideas for other games, etc.