The sentence is mostly clear but can be made grammatically correct with a slight adjustment. The phrase “No bag day and colored day” could be confusing without context. Here’s a corrected version:
“I thought we agreed to combine No Bag Day and Colored Day.”
### Meaning:
The sentence expresses that the speaker believed there was a consensus on merging or incorporating the events called "No Bag Day" and "Colored Day."
### Rephrased