How much do you tip the bartender (as a guest?)

10 at the beginning, 10 at the end. Most bars don't even have too jars you just slide it over to them. It isn't required to tip, its generous.

I always tip bartenders as a guest. I was always taught to take out like $5-10 and tip them once with your first drink and it takes care of it for the night. Typically they say it's $1 per drink. I usually tip 10 to be generous since weddings are crazy for bartenders.

I always tip as a guest. When I was the bride, whether or not a guest tipped did not impact what I tipped my vendors.

I usually tip $20 at the beginning of the night for an open bar for both me and FH and that's it.

I usually will leave a large tip once at the beginning of the evening (selfishly, to get better service), but am not sure tipping is the norm. I think it would be rude of a bride and groom to assume the tip is covered by their guests, but they wouldn't be at fault if guests tip on their own.

For those of you that ASSUME the host is tipping are flat out cheapskates and assholes. Don't assume. Tip those that provide you a service. I always tip a dollar per drink at a wedding.