Shavuos is not a dairy holiday.
Now let me explain.
Yes, one eats dairy on Shavuos. The well-known custom is based on the idea that after the Jews received the Torah which contained, amongst other things, the requirement to eat meat slaughted by shechitah they returned to their tents and realized all the meat they had was now trief. So dairy was the only option for their first post-matan Torah meal, hence the custom to eat dairy on Shavuos.sons
And yes I know it's not such an old custom and that other reasons are given by the poskim. However, I would like to point out that I now know many people who think that eating dairy on Shavuos means making all the Yom Tov meals milchig and, in my capacity as the Chief Rabbi of Stoney Creek, I would like to rail against this misunderstanding.
If one really wants to observe the custom of eating dairy on Shavuos as it is properly understood, here's what one does. After shul on the morning of the first day one returns home, makes kiddush and then makes a motzi and serves milchig appetizers. One must be very careful to use only one of the two breads at this point. Then one clears the dairy equipment, sets the table for meat and puts out all the meat stuff and after a 1/2 hour break or so the meal is continued with fleishigs using the second loaf of bread.
If this is hard for some folks, then making the first day's lunch milchig is fine but folks, the rest really should be meat. It's still Yom Tov after all.