It's ludicrous to celebrate 50 years of Doctor Who if they totally ignore the first 42 years. Hell, even if they just had a picture of an old Companion or a toy K-9 in the background or a mention of celery or jelly babies, that would be better than nothing at all.
Or, you know, the TARDIS.
I've just celebrated my 40th birthday without ever mentioning anything that happened to me during the first 35 years of my life except my birth, and I don't think it was ludicrous. That the show still exists is the only celebration that is really needed.