In Seattle for convention
where to eat near the convention center at around 6:00pm
one guest gluten free, and no dairy
So if you're near the Convention Center you're a short cab ride or a decent walk away from a multitude of choice. Lots of threads on this so you could do a quick search on either Seafood or Asian/Chinese on these boards. You're close to the International District or ID (our version of Chinatown) with dozens of great Asian Seafood places, and you're also close to Pike Place and the Waterfront, which will also have great seafood nearby.
I believe Tulio's, an Italian restaurant downtown, has a gluten free menu.
1100 5th Ave., Seattle, WA 98101
You can walk up Pike st and hit up Homegrown for salads and sandwiches.
Don't know about Gluten-free and non-dairy but along that same neighborhood is Baguette Box and Taylor's Shellfish that has a chowder bar.
1203 Pine St, Seattle, WA 98101