A Useful Travel App might be able to advise alternatives if it's late.
To Glasgow Central Station: 2329
To Glasgow Queen Street Station: 2329 (walk via Glasgow Central)
To Partick Station: 2345
From Glasgow Central Station: 2341
From Glasgow Queen Street Station: 2321 (walk via Glasgow Central)
From Partick Station: 2325
To Glasgow Central Station: 2330
To Glasgow Queen Street Station: 2330 (walk via Glasgow Central)
To Partick Station: 2350
From Glasgow Central Station: 2347
From Glasgow Queen Street Station: 2327 (walk via Glasgow Central)
From Partick Station: 2327
Last train from Govan: 2316
Last train from St Enoch: 2330
Last train from Govan: 2316
Last train from St Enoch: 2328
Last train from Govan: 1750
Last train from St Enoch: 1803
Last train from Govan: 1750
Last train from St Enoch: 1800
If you're able to walk, this may be the easiest option. Glasgow isn't a big city and the city centre to the SEC is around a 35-40 minute walk.
While Glasgow has night buses, they only run on Friday and Saturday nights and even the best route McGills' N38) does not run particularly often or close to the SEC.
The best option may be a taxi – either a black cab from one of the city centre cab ranks, or Uber or GlasGo private hire cabs.