Gina eagerly anticipated the conference

[Bassim]

Have I made any mistakes?

Gina eagerly anticipated the conference on education in Africa, but her mood shifted when she noticed that the majority of her female colleagues were wearing ethnic necklaces. Gina hated to look like anyone else and she sneaked into the toilet where she removed her necklace and put it into her pocket.

 

[emsr2d2]

Have I made any mistakes?

Gina had been eagerly anticipating the conference on education in Africa, but her mood shifted when she noticed that the majority of her female colleagues were wearing ethnic necklaces. Gina hated to look like anyone else and she sneaked into the toilet where she removed her necklace and put it into/in her pocket.

See above. Is the conference actually in Africa and it's about education or is it a conference on the subject of "education in Africa"? It's not pertinent to the grammar but the opening is ambiguous.
I would use "snuck" as the simple past of "sneak" but I was surprised to see online that it is chiefly considered to be North American usage. It's been used as the simple past amongst my family and friends for as long as I can remember.
I'd use "in her pocket" but "into" isn't wrong.

 

[Bassim]

I imagined the conference to be about education in Africa, but its venue was somewhere in Europe.

 

[Roman55]

I never use snuck.

 

[Rover_KE]

Neither do I, but I did when I lived in the USA — like I said semester/way to go!/diaper/kick-ass etc over there.

 

[Tdol]

I don't use it, but I have heard it used in the UK.

 

[Tdol]

It seems fine to me in Emsr2d2's version. For me, it is the verb form more than the verb.

 

[YAMATO2201]

Gina eagerly anticipated the conference on education in Africa,

Is it correct to say "the 2018 London Conference on African Education"?

Gina had been eagerly looking forward to the 2018 London Conference on African Education.

 

[emsr2d2]

Yes.

 

[GoesStation]

Is it correct to say "the 2018 London Conference on African Education"?

Gina had been eagerly looking forward to the 2018 London Conference on African Education.

Yes, if that's the name of the conference. If you're just describing it, you can use the same words but capitalize only the proper nouns.