What are some cost efficient ideas for a lowkey coed wedding shower/bach party I'm throwing?

I'm hosting a coed wedding shower/bach party next weekend and I'm a little strapped for ideas. Per the bride's request, it's going to be extremely casual (it's even mostly BYOB).

The party itself will be at a restaurant event room, but I'm a little stuck on how to decorate it. I'm strapped on cash, so I would love any low-cost party games/decor/ideas to make it fun for everyone.

The guests will primarily be friends of the bride and groom, so propriety isn't a concern - in fact, they are mostly restaurant industry folks so there will be a lot of drinking.

If anyone has ideas for this, please let me know!

*Edit: I should also clarify, the bride works at the restaurant where the party will be, so I was able to get that space for free. There won't be any catering/waitstaff there.